WO2021186465A1

WO2021186465A1 - Canister mounting

Info

Publication number: WO2021186465A1
Application number: PCT/IN2021/050248
Authority: WO
Inventors: Thangavel DEEPAN; Venkata Manga Raju Karnam; Ramesh VAIDHEESWARAN; Subash Manickam; Venkatesh LAVANYA
Original assignee: Tvs Motor Company Limited
Priority date: 2020-03-16
Filing date: 2021-03-12
Publication date: 2021-09-23

Abstract

The present invention relates to a step through type vehicle (100), where said vehicle (100) comprises of a mono tube type frame (101), engine (125), cylinder head (123), cylinder (124), fuel tank module (103), canister assembly (306). The frame assembly includes a main tube (101b), a down tube (101c). The canister assembly (306) is mounted to the frame with the canister bracket (204) which is detachably attached to the frame bracket (206), further covered by a cover frame (118), thereby, ensures the ease of accessibility and serviceability of the canister assembly (306).

Description

CANISTER MOUNTING

TECHNICAL FIELD

[0001] The present subject matter relates to a step through type vehicle. More particularly, the present subject matter relates to the canister of the step through vehicle.

BACKGROUND

[0002] Step through type saddle vehicles are basically one of the most affordable and popular kind of the vehicle among the world’s population. These kinds of vehicles are mostly powered by the two stroke or four stroke engines. Conventionally carburetor type system has been implemented in vehicles for supplying & metering fuel quantity to the engine powering such vehicles. With need to enhance performance, power output & efficiency of same engine as well as reduce emissions, fuel injection system has become popular in step through type vehicles. Thus, a fuel management system is implemented in vehicles to control the fuel being supplied to the engine at right time & in right quantity.

[0003] Often with vehicles being commercialized for use in multiple markets & variety of users, depending on the market needs, vehicle manufacturers face a challenge of handling variety of fuel supply system for given vehicle with variant of carburetor system vis-a-vis fuel injection system. The fuel management system of the internal combustion engine has to use the combination of fuel tank along with the fuel pump module to deliver fuel in the engine with the help of the fuel injector. The vehicle fuel system is responsible for delivering the right amount of fuel from a fuel tank to the fuel injector, to maintain an appropriate amount of fuel in the engine for the process of internal combustion.

[0004] With ever increasing number of vehicles used for personal transport and its contribution to the pollution of environment in terms of the emission, evaporative emissions also add to the pollution in terms of unburnt and burnt hydrocarbons. By very basic physical properties of gasoline fuels primarily used for transportation, evaporative emissions are bound to exist under normal environment conditions and temperatures ranging from ambient temperatures to temperature encountered during various operating conditions. The gasoline fuel has propensity to vaporize at room temperatures within respective container and this emission needs to be purged to avoid undue pressure development in the container. Such emissions are often referred to as evaporative emissions. There is a constant drive from manufacturers to bring down the extent of emissions in the automotive sector.

BRIEF DESCRIPTION OF THE DRAWINGS

[0005] The detailed description is described with reference to an embodiment in a saddle type step thru vehicle along with the accompanying figures. The same numbers are used throughout the drawings to reference like features and components.

[0006] Fig.l is a side view of a step through type vehicle as per one embodiment of the present invention.

[0007] Fig.2 is a perspective view of a frame of step through vehicle.

[0008] Fig.3 is an inverted view of the fuel tank module of the step through as per one embodiment of the present invention.

[0009] Fig.3a is an inverted view of the fuel tank module with ROV of the step through vehicle

[00010] Fig. 4 is an exploded view of the canister assembly as per one embodiment of the present invention.

[00011] Fig. 4a is a sectional view of the boot canister as per one embodiment of the present invention

[00012] Fig. 5 is a right-side view of the step through vehicle as per one embodiment of the present invention.

DETAILED DESCRIPTION

[00013] The conventional carburetor fuel systems lack in several major aspects e.g. poor efficiency in terms of fuel consumption and performance of the engine. Also, it is one of the main contributors for the emission of harmful gases which are the main cause for polluting the environment.

[00014] In order to address the shortcomings of the conventional carburetor system, an Electronic Fuel Injection System or EFI was developed as an improvement over the carburetor in order to calibrate and optimize the fuel/air ratio. The electronic fuel injection system or EFI is utilized to better control fuel to air ratios in order to provide better performance, improve emissions and drivability. Moreover, the need of precise fuel supply creates a necessity for introduction of Electronic Fuel Injection (EFI) system in existing carburetor vehicles.

[00015] Generally, the typical electronic fuel injection system comprises a fuel tank, a fuel pump that is operatively coupled to the fuel tank that directs fuel into the engine. Further, as an improvement over the carburetor, the Electronic Fuel Injection system (EFI) utilizes advanced electronic techniques to adjust the air fuel mixture to reduce the evaporative emission in the environment. Hence, as engines shifts from carburetors and towards fuel injection, the conversion of the carburetor to the Electronic Fuel Injection system (EFI) involved different types of electrical and mechanical modifications in the vehicle.

[00016] Further, for reducing the evaporative emission in the environment, the evaporative fuel recycle systems were designed to store and dispose of the fuel vapors before they can escape into the atmosphere. A typical system consists of a canister full of charcoal, valves, hoses, vents in the fuel lines and a sealed fuel tank cap. When fuel evaporates inside the fuel tank, the excess vapors are transferred to the canister. They are stored there until they can safely be transferred back to the engine to be burnt with the normal air-fuel mixture.

[00017] Ideally, the fuel system should be completely closed to prevent any vapor escape, but as it is evident form the fact that under extreme conditions like heat and cold which affects the pressure inside the fuel tank and fuel tank head space, there arises a need for venting and vacuum pressure relief functions to limit the positive and negative pressure inside the fuel tank respectively. As fuel is consumed by combustion chamber inside the engine, therefore during introduction of fuel into combustion chamber air is introduced inside the headspace of the fuel tank to limit the magnitude of negative tank pressure. Generally, such venting and vacuum relief functions are performed through valves.

[00018] The step through type vehicle typically has a canister as an essential component of evaporative fuel recycle system which adsorbs the hydrocarbon vapors from the fuel tank and supplies evaporated fuel to an engine for combustion which is positioned near to engine [00019] In the step through type vehicle having an evaporative fuel recycle system comprises canister, roll over valve, purge valve and other connecting elements to connect from engine to fuel tank. Here, canister is a small round or rectangular plastic or steel container mounted somewhere in the vehicle. It is usually hidden from view and may be located in a corner of the engine compartment or inside a side panels. The canister is filled of activated charcoal. The charcoal acts like a sponge and adsorbs and stores fuel vapors. The vapors are stored in the canister until the engine is started, is warm and is being driven. The purge control valve when open, it allows intake vacuum to siphon the fuel vapors into the engine. The canister is connected to the fuel tank via the hoses. Hence, escape of the fuel vapors is avoided, however venting of tank is still required.

[00020] Generally various valves working in association with the fuel tank may become the potential sources of fuel leakage during roll over type accident where if such leakage of fuel happens it may lead to fire. Hence to avoid any such dire consequences a roll over valve provided in the evaporative fuel recycle system to resist the flow of fuel in such situations. The roll over valve is generally open and it closes on a predetermined amount of tipping indicative of vehicle roll over. Under normal circumstances, the evaporative fuel recycle system having canister causes few problems. The most common problems associated with the evaporative fuel recycle system having canister are a faulty purge control, increased hose length, pinching of hose pipe, inaccurate orientation of roll over valve, water entry etc.

[00021] Typically, manufacturers look for implementing a canister system to address these emissions to the extent feasible. Bigger the size of the canister, the higher the emissions can be adsorbed. Such canister solutions bring with them additional components like hoses, valves etc. which need to be packaged in the same vehicle without compromising on the size of the vehicle as well as minimize cost impact. Therefore, there exists a continuous challenge for automotive manufacturers to address the evaporative emissions as well as avoid discharge of the same into the atmosphere within minimum space / size of the vehicle as well as at a reduced cost and weight impact. Further, the challenge is particularly significant for a step through vehicle where impact on compactness, weight & cost become critical. In known art, canister holder assembly is mounted to the side cover which has many disadvantages such as high takt time, difficulty of assembly in production line, inconvenience to conduct online testing in EVAP (Evaporative Emissions) system. The above-mentioned mounting arrangement increases the servicing time as well, as during the time of servicing, the complete side panel needs to be remove. The removal of side panel, leaves the canister assembly hanging which ultimately affects the life of the hoses as attached.

[00022] For the vehicle having compact layout, the disposition of the canister on the side frame is complex and difficult due to lack of space, also the serviceability and accessibility of the canister is restricted because of the compact layout of the vehicle. For servicing, one has to remove all the components which increase the servicing time. Further, such disposition results in change in design or change in location of neighboring parts in the compact layout, thereby increasing cost, undesirably high lead time for change over as well as more variety in parts.

[00023] Hence, there exists a challenge of designing an efficient evaporative fuel recycle system, which can satisfactorily accommodate all essential elements including canister, roll over valve, hose piping and purge control valve in step through type saddle vehicle without any major change in design and manufacturing set-up of the vehicle.

[00024] Therefore, there is a need to have an improved mounting of canister assembly which overcomes all of the above problems and other problems known in the art.

[00025] The present invention provides a solution to the above problems while meeting the requirements of minimum modifications in vehicle from carburetor system to fuel injection system, at low cost with ease of manufacturing etc.

[00026] With the above objectives in view, the present invention relates to the electronically controlled fuel injection system and more particularly to the improved mounting of canister assembly where the canister assembly is mounted to the bracket, thereby, cost effective and also, avoiding potential risk of tilting of bracket due to mishandling of frame assembly.

[00027] As per one aspect of the present invention, the frame of the step through vehicle comprises of the main frame, down frame etc. The horizontal portion of the main frame is provided with an engine mounting bracket and the engine is mounted to the frame through the engine mounting bracket to ensure the rigid mounting of the engine. Below the horizontally extending downward portion of main frame, a cylinder head is disposed in front of the crankcase and the secondary air injection valve. A secondary air injection filter is disposed on the left-hand side of the frame and two cover frame mounting brackets are disposed in the vehicle width direction. Further, as per one aspect of the present invention, a hose guide is attached to the engine mounting bracket, which ensures the channelizing of the hose to the dead space formed between the engine and the frame, thereby, configuring the canister in the dead space.

[00028] As per one aspect of the present invention, frame bracket which is smaller in size is attached to one of the pair of cover frame mounting bracket and further, the canister bracket is detachably attached to the frame bracket through a fastener, thereby ensuring a rigid mounting of canister bracket and also, ensures ease of assembly and serviceability of the canister. The cover frame and the floorboard are disposed with the cover frame mounting bracket in the step through vehicle.

[00029] Further, as per one aspect of the present invention, the pair of cover frame mounting bracket have a flat surface on the down tube, the frame bracket has a welded nut attached to its bottom surface and a small flange which engages with the flat surface of the cover frame mounting bracket. Further, as per one aspect of the present invention, the canister bracket has two ends, where the one end has a mounting hole such that the fastener is inserted into the mounting hole and then tightened with the weld nut in the frame bracket, thereby ensuring a resilient mounting of the canister bracket, and also, avoiding the deformation in the bracket.

[00030] Further, the other end of the canister bracket has I shaped flange (when view from top) & has a confirming profile with the slot of boot canister, where the canister assembly is disposed into the profile of the canister bracket, ensuring resilient mounting of the canister assembly, thereby, reducing the vibration\noise due to interference with SAI filter as well as canister bracket. Additionally, this increases the ease of serviceability of the canister assembly as the canister assembly can be dismantled by loosening the fastener. Further, the remaining surfaces of frame bracket are perpendicular to each other, which ensures the poka yoke assembly, thereby, restricting the anti-rotation of the canister bracket. [00031] Further, the fuel tank module is mounted to the main frame above engine & it includes the fuel tank module outer portion, fuel tank module inner portion, a vapor tube, hose guide, ROV bracket and an EVAP system (Evaporative Emission (automotive)) and the air cleaner box is mounted in front of the frame. The frame is connected to the throttle body. The throttle body is mounted between the air cleaner box and engine. Further, as per one aspect of the present invention, the throttle body has a purge nipple projected towards the LHS (Left Hand Side) of the vehicle.

[00032] As per one aspect of the present invention, the EVAP system includes the canister, a roll over valve (ROV), a purge control valve (PCV), a boot canister, a boot ROV, a hose ROV, a hose canister, a hose PCV, a hose purge, a hose atmosphere, a hose drains and hose clamps. The canister, boot canister, PCV, hose PCV, hose purge, hose atmosphere & hoes drain all together called as canister assembly. The ROV and PCV have two ports respectively namely IN port and OUT port and the canister assembly has four ports namely PORT A, PORT B, PORT C and PORT D. The ROV is mounted to the fuel tank module by boot ROV and a bracket ROV where the bracket ROV is attached to the fuel tank module inner portion. A hose guide is mounted to the fuel tank module inner portion between the vapor tube and ROV, which avoids pinching of hose ROV between fuel tank module and frame assembly.

[00033] As per one aspect of the present invention, the fuel vapor accumulated in the fuel tank is carried away by the vapor tube, where the vapor tube is connected to the IN port of the ROV through the hose ROV, where the ROV ensures the restriction of the entry of liquid fuel into the canister during accident or rollover condition of the vehicle. Further, as per one aspect of the present invention, the OUT port of ROV is connected to the Port A of canister through the hose canister, where the canister having the activated charcoal adsorbs the fuel vapors from the fuel tank with the help of activated carbons.

[00034] Further, as per one aspect of the present invention, the Port B of the canister is connected to the IN port of PCV through hose PCV and OUT port of PCV is connected to the purge nipple of the throttle body through the hose purge, where the PCV is a spring-controlled diaphragm valve which opens only beyond certain vacuum. Further, after the PCV is opened, the entire fuel vapors will be sucked from the canister and routed to the throttle body of the engine, thereby ensuring proper combustion and emission. Further, as per one aspect of the present invention, the third port of the canister that is Port C is open in the atmosphere through hose drain for draining the liquid fuel which accidentally enters the canister during accident or roll over condition of the vehicle. Further, as per one aspect of the present invention, the fourth port of the canister Port D is left open in the atmosphere through the hose atmosphere for fuel tank breathing, thereby maintaining the pressure difference in the fuel tank and atmosphere. Further, as per one aspect of the present invention, the other end of the hose atmosphere and hose drain is routed into the engine mounting bracket of the frame where the engine mounting bracket has an opening in front of the rear fender, which ensures the restriction of water/dust entry in the canister by utilizing the dead space present in the frame..

[00035] Further, as per one aspect of the present invention, the boot canister has three openings named as opening A, opening B, opening C, where the opening A holds canister assembly, opening B holds PCV and Opening C acts as a guiding member for hose purge, thereby, eliminating the need of separate mounting for PCV and additional hose guide and additionally reducing the cost of vehicle.

[00036] Various other features of the invention are described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers generally indicate identical, functionally similar, and/or structurally similar elements. The drawing in which an element first appears is indicated by the leftmost digit(s) in the corresponding reference number. With reference to the accompanying drawings, wherein the same reference numerals will be used to identify the same or similar elements throughout the several views.

[00037] Further “front” and “rear”, and “left” and “right” referred to in the ensuring description of the illustrated embodiment refer to front and rear, and left and right directions as seen in a state of being seated on a seat of the saddle type vehicle. Furthermore, a longitudinal axis refers to a front to rear axis relative to the vehicle, while a lateral axis refers to a side to side, or left to right axis relative to the vehicle. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. [00038] Fig. 1 is the left side view of an exemplary step through type vehicle, in accordance with an embodiment of present subject matter. The vehicle (100) has a mono tube type frame (101), which acts as the skeleton for bearing the loads and is also referred to as backbone frame as (shown in Fig 2). Instrument cluster (119) is mounted on handle bar assembly (126). The handle bar assembly (126) is pivotally disposed through the head tube where it includes brake levers (113). The handle bar assembly (126) is connected to a front wheel (129) by one or more front suspension(s) (130). A front fender (131) is disposed above the front wheel (129) for covering at least a portion of the front wheel (129). A leg shield (112) is provided on said vehicle (100). A fuel tank (103) having fuel cap (114) is mounted to the main tube (101b) (as shown in Fig. 2) of the mono-tube type frame (101) and it is disposed in the front portion F of a step-through space of the mono tube type frame (101). Said vehicle (100) having lighting means which includes Head lamp (127), Tail lamp (106), Turning indicators includes front side indicators (111) and rear side indicator (102) respectively and daytime running lamp (104). The engine (125) is mounted to the lower portion of said mono-tube type frame (101). In an embodiment, the engine (125) is an IC engine. The fuel tank (103) is functionally connected to the engine (125). Further, the canister assembly (306) is mounted on the vehicle.

[00039] In an embodiment, cylinder axis (C-C’) inclined to a front of said vehicle (100). A swing arm (134) is swingably connected to the mono-tube type frame (101). A rear wheel (133) is rotatably supported by the swing arm (134). One or more rear suspension(s) (135) connect the swing arm (134) at an angle, to sustain both the radial and axial forces occurring due to wheel reaction, to the mono-tube type frame (101). A license plate (105) and reflector (116) mounted on a rear fender (128) is disposed above the rear wheel (133). A seat assembly (132a, 132b) is disposed at a rear portion (R) of the step-through space. In an embodiment, the seat assembly (132) includes a rider seat (132a), and a pillion seat (132b). Said vehicle (100) is provided with the grab rail (109). Further, the seat assembly (132a, 132b) is positioned above the rear wheel (133). The vehicle is supported by a center stand (120) mounted to the frame assembly. A tool box (110) is provided on the left side of said vehicle (100). A cover member (118) is mounted on down tube (101c) (as shown in Fig. 2). The body side cover member (118) covers at least a portion of the engine (125) & frame member (101c). [00040] The engine (125) includes an air intake system (not shown), an exhaust system (not shown), and a starter system (not shown). The starter system includes an electric starter mechanism or a mechanical starter mechanism. The electrical starter system is powered by an auxiliary power source, for cranking the engine. Power generated by engine is transferred to the rear wheel (133) through a transmission system (not shown).

[00041] The engine (125) comprises a cylinder head (123), a cylinder (124), a crankcase (503 (as shown in fig.5) and a chain cover (121) in order from the front to the rear direction of an engine assembly (122). The cylinder (124) protrudes in a forward direction from the front-end portion of the crankcase (503).

[00042] Fig. 2 is a perspective view of the frame which is generally of a convex shape, where main tube (101b) extending rearwardly and downwardly from a head tube (101a) of the mono-tube type frame (101), further a down tube (101c) of said mono-tube type frame (101) extends rearward, along a longitudinal axis (L-L’) of said vehicle (100) from a rear portion of the main tube (101b). The fuel tank (103) (as shown in Fig. 1) is attached on the main tube (101b) through attaching means which includes at least one or more mounting brackets (203).

[00043] The engine (125) (as shown in Fig. 1) is a four-stroke air-cooled engine where the center portion of the engine is supported to the mono-tube type frame (101). The cover member (118), a floorboard is disposed above the down tube (101c) using attaching means. The attaching means includes two cover frame mounting brackets (201) attached to the down tube (101c) of said mono-tube type frame (101) to support the cover member (118), Both the brackets (201) are placed parallel when viewed from top of said vehicle (100).

[00044] Further, the main tube (101b) includes an engine mounting bracket (202) and a pair of cover frame mounting bracket (201) in the vehicle width direction, where the engine is mounted horizontally below the down tube (101c). Further, as per one embodiment of the present invention, a hose guide (205) is mounted on the engine mounting bracket (202) and a frame bracket (206) is integrally attached to at least one of the cover frame mounting brackets (201). Further, as per one embodiment of the present invention, the canister bracket (204) is detachably mounted on the frame bracket (204) with the fastener (507), thereby, ensuring ease of assembly in the production line and also, ensures ease of dismantling of canister assembly thereby ensuring ease of servicing.

[00045] Fig, 2a is the inverted view of the frame bracket (206). As per one embodiment of the present invention, the frame bracket (206) includes a welded nut (212) to the bottom surface (211) of the frame bracket (206) and a flange termed here as surface B (210) which engages or attaches with the flat surface (207) of the cover frame mounting bracket (201). Further, as per one embodiment of the present invention, the frame bracket (206) includes two surfaces B & C (210, 213) where the surface B and surface C, are substantially perpendicular to each other, thereby ensuring the poka yoke assembly, thereby, acting as the restraining member to restrict the anti-rotation of the canister bracket.

[00046] Fig. 2b is the left side view of the canister bracket (204). Further, as per one embodiment of the present invention, the canister bracket includes at least two ends (208, 209), where one end (208) has a slot (208a) through which the fastener (507) inserted into the slot (208a) and then tightened with the welded nut (212) in the frame bracket (206), ensures that the canister bracket is detachably attached to the frame bracket, which increases the ease of assembly and serviceability.

[00047] Fig. 3 is the inverted view of the fuel tank module. Further, as per one embodiment of the present invention, the fuel tank module (103) includes the fuel tank module outer portion (301), fuel tank module inner portion (302), a vapor tube (303), a hose guide (304), a ROV bracket (305) and an EVAP system (as shown in fig.3a), where EVAP system includes canister assembly (306), a roll over valve (ROV) (315), a boot ROV (316), a hose ROV (317), a hose canister (314) and further, canister assembly (306) includes purge control valve (PCV) (310), a boot canister (309), a hose PCV (312), a hose purge (313), a hose atmosphere (307), a hose drain (308) and hose clamps (311). Further, as per one embodiment of the present invention, the ROV (315) is attached to the fuel tank module (103) by the boot ROV (316) and bracket ROV (305), ensuring resilient mounting of the ROV and each hose is sealed by the hose clamps, to ensure the sealing of the hoses to avoid any leakage. Further, as per one embodiment of the present invention, the hose guide (304) is mounted to the fuel tank module inner portion (302) between the vapor tube (303) and ROV (315), which avoid the pinching of hose ROV (317). [00048] Fig. 4 is the exploded view of the canister assembly. As per one embodiment of the present invention, Further, as per one embodiment of the present invention, the other end (209) of canister bracket (204) (as shown in fig.2b) has a flange having an I shape which act as a slot conforming with the slot (405) of the boot canister (309), ensuring resilient mounting of the canister assembly, thereby, the vibration/noise due to the interference with the surrounding components are also reduced. Further, as per one embodiment of the present invention, the PCV (310) has two ends where one end (310a) is IN port and another end (310b) is OUT port, where the ports are attached to canister and the throttle body.

[00049] Fig. 4a is the perspective view of the boot canister (309). Further, as per one embodiment of the present invention, the boot canister (309) includes three openings, opening A (402), opening B (403) and opening C (404). The opening A is having a central cup shaped structure, where the canister (401) is mounted in the opening A (402) of the boot canister (309), which ensures resilient mounting of the canister in the boot canister (309). Further, as per one embodiment of the present invention, plurality of arms extends integrally from the body of the central cup shaped structure, where each arm of the plurality of arms has an opening (Opening B & Opening C) to accommodates the parts associated with the functioning of the canister. The PCV (310) is disposed in the opening B (403) of the boot canister (309) and opening C (404) acts as a guiding member for hose purge (313) as the another end (310b) of PCV (310) is attached to one end (313a) of hose purge (313) and another end (313b) of hose purge (313) is guided through Opening C and hence, attached to a throttle body (as shown in fig. 3a). Therefore, this eliminates the separate mounting for PCV and additional hose guide, thereby reduces the number of components and additionally reduces the cost of the vehicle.

[00050] Further, as per one embodiment of the present invention, the canister has four ports namely Port A, Port B, Port C and Port D, where the ROV (315) and PCV (310) are connected to the IN and OUT port respectively. Further, the fuel vapors are carried outstream by the vapor tube (303) from the fuel tank module (103) and is connected to the IN port of the ROV (315) through hose ROV (317), where the ROV (315) restricts the entry of the liquid fuel in the canister during accident or vehicle roll over condition. The OUT port of the ROV (315) is attached to the Port A of canister (401) through hose canister (314), where the canister has activated carbon particles inside and hence the fuel vapors from the fuel tank module is adsorbed by the canister with the help of activated carbons. As per one embodiment of the present invention, the boot canister (309) includes a projected portion (406) extending from the opening A (402), where the projected portion (406) includes plurality of slots (407, 408). The plurality of slots (407, 408) guides another end (312b) of hose PCV (312), i.e., attachment of Port B of canister (401) to the IN port of the PCV and Port A of the canister (401), thereby ensures ease of assembly in production line.

[00051] Further, as per one embodiment of the present invention, the Port C is left open to the atmosphere through the hose drain (308) for draining the liquid fuel which accidently enters the canister (401) during accident or rollover condition and the Port D of the canister (401) is left open to the atmosphere through hose atmosphere (307), thereby, ensuring venting of both vacuum and pressure from the fuel tank module (103).

[00052] Fig. 5 is the left side view of the step through vehicle. As per one embodiment of the present invention, a secondary air injection valve (502), a SAI filter (506) are disposed on the left hand side of the frame (101) and in front of the crankcase (503) and air cleaner box (not shown) is arranged in front of the frame (101) and the throttle body (501) is connected to the air cleaner (not shown) and has a purge nipple (509) projecting towards the LHS of the vehicle, Further, as per one embodiment of the present invention, the Port B of the canister (401) (as shown in fig.4) is connected to the IN port (310a) of the PCV (310) through hose PCV (312), where the PCV (310) is a spring control diaphragm valve which opens at the predetermined vacuum in the engine. Once the PCV (310) is opened, fuel vapors will be sucked from the canister (401) and further transferred to the throttle body (501) through the OUT port (310b) of the PCV (310), where the OUT port (310b) of the PCV (310) is connected to the purge nipple (509) of the throttle body (501) through hose purge (313), thereby ensuring the combustion of the fuel vapor with the air and fuel mixture in the combustion chamber of engine. Further, the mounting of the canister (401) with the canister bracket (204) on the frame bracket (206) with the fastener (507), ensure the ease of serviceability and ease of conducting EVAP online tests, as the serviceability can be done by loosening only one fastener and the other one will be fixed in the vehicle such that the cover frame can be rotated to access the parts under cover frame as well as the floor board is enabled by removing the cover frame (118) of the step through vehicle.

[00053] Further, as per one embodiment of the present invention, the hose atmosphere (307) and hose drain (308) is routed into the engine mounting bracket (202) and guided by the hose guide (205), thereby, ensuring the utilization of dead space present between the frame (101) and engine mounting bracket (202) and avoid the potential chances of hoses getting pinched with chain cover.

[00054] The invention helps in overcoming the problem of space constraints, minimizing the use of new components, increasing the ease of accessibility and serviceability of the canister assembly of the vehicle while maintaining the overall weight and width of the vehicle and additionally makes it cost effective.

[00055] Advantageously, the embodiments of the present invention, additionally describes the potential improvements in the mounting of canister assembly, where the canister assembly is mounted on the canister bracket which is detachably attached to the frame bracket. This facilitates the simple and easy mounting of the canister assembly which efficiently increases the ease of accessibility and serviceability of the canister assembly in the vehicle.

[00056] Many other improvements and modifications may be incorporated herein without deviating from the scope of the invention.

List of reference symbol:

Fie. 1:

100: Step Through Vehicle.

126: Handle Bar Assembly 119: Instrument Cluster 127: Head Lamp 111: Front Side Indicator 104: Daytime Running Lamp 112: A leg Shield 131: A front F ender

129: Front Wheel 130: Front Suspension 113: Brake Lever 103: Fuel Tank module

114: Fuel cap 118: Cover Member 123: Cylinder Head 124: Cylinder 122: Engine Assembly

125: Engine

132 (132a, 132b): Seat Assembly 101 : Mono tube frame 109: Grab Rail 106: Tail Lamp

105: License Plate 102: Rear Side Indicator 128: Rear Fender 116: Reflector 135: Rear Suspension

133: Rear Wheel 134: Swing Arm 121: Chain Cover

120: Center Stand 110: Tool Box

107: Canister Assembly C-C’: Cylinder Axis

Fig. 2: 101 : Mono Tube Type Frame

101a: Head Tube 101b: Main Tube 101c: Down tube 101 d: Rear Tube 201 : Pair of cover frame mounting bracket

202: Engine Mounting Bracket 203: Front Bracket 204: Canister Bracket 205: Hose Guide 206: Frame Bracket

207 : Flat Surface 210: Surface B 211 : Bottom Surface 212: Welded Nut 213: Surface C

208: One End 208a: Slot

209: 1 shaped Flange.

Fig. 3 304: Hose Guide

303: Vapor Tube

301 : Fuel Tank Module Outer Portion 302: Fuel Tank Module Inner Portion 305: ROV Bracket

Fig.3a

307: Hose Atmosphere 308: Hose Drain 309: Boot Canister 310: Purge Control Valve (PCV)

311: Hose Clamps 312: Hose PCV 313: Hose Purge 314: Hose Canister 315: ROV

316: Boot ROV 317: Hose ROV.

Fig.4:

Port A Port B Port C Port D

401: Canister

405: Slot 407: one slot on projected portion 312a: one end of hose PCV 310a: one end of PCV 310b: another end of PCV 313a: one end of hose purge

408: another slot on projected portion 313b: another end of hose purge 312b: another end of hose PCV Fig. 4a 402: Opening A

403 : Opening B 404: Opening C

Fig.5

501 : Throttle Body 502: SAI Valve

503: Crankcase 506: SAI Filter 507: Fastener 509: Purge Nipple.

Claims

We Claim;

1. A step through vehicle (100), said vehicle (100) comprising: a monotube type frame (101) providing skeletal support to said vehicle (100);

Said frames (101) includes a head tube (101a), a main tube (101b), a down tube (101c), an engine mounting bracket (202) and a pair of cover frame mounting bracket (201); a fuel tank module (103) mounted on said main tube (101b); said fuel tank module (103) includes the fuel tank module outer portion (301), fuel tank module inner portion (302), a vapor tube (303), a hose guide (304), a ROV bracket (305) and an EVAP system; said EVAP system includes a canister assembly (306), a roll over valve (ROV) (315), a boot ROV (316), a hose ROV (317), a hose canister (314); said canister assembly (306) includes a purge control valve (310), a boot canister (309), a hose PCV (312), a hose purge (313), a hose atmosphere (307), a hose drain (308), a hose clamp (311); a cover member (118) disposed above said down tubes (101c) of said mono tube type frame (101) by said pair of cover frame mounting bracket (201); an engine (125) mounted on the lower portion of said mono-tube type frame (101); and said canister assembly (306) is mounted to said frame (101) with plurality of mounting means.

2. A plurality of mounting means for a step through type vehicle (100), said plurality of mounting means comprising; a frame bracket (206); a canister bracket (204); said frame bracket (206) is integrally attached to a monotube type frame (101) and said canister bracket (204) is detachably attached to said frame bracket (206)

3. The step through vehicle (100) as claimed in claim 1, wherein said engine mounting bracket (202) has a hose guide (205).

4. The step through vehicle (100) as claimed in claim 1 or claim 2, wherein said frame bracket (206) is mounted to at least on a pair of said cover frame mounting bracket (201).

5. The step through vehicle (100) as claimed in claim 2 wherein said frame bracket (206) includes three surfaces (211, 210, 213), where a welded nut (212) is attached to a bottom surface (211) of said frame bracket (206).

6. The step through vehicle (100) as claimed in claim 5, wherein said pair of cover frame mounting bracket (201) has a flat surface (207), where said surface B termed as flange (210) attaches with said flat surface (207) of said pair of cover frame mounting bracket (201).

7. The step through vehicle (100) as claimed in claim 5, wherein said surface B (210) and said surface C (213) are perpendicular to each other.

8. The step through vehicle (100) as claimed in claim 2, wherein said canister bracket (204) includes at least two ends (208, 209), where one end (208) has a slot (208a) through which said fastener (507) is inserted into said slot (208a) and then attached with said welded nut (212) in said frame bracket (206).

9. The step through vehicle (100) as claimed in claim 8, wherein said another end (209) of canister bracket (204) has a flange having an I shape which act as a slot conforming with a slot (405) of said boot canister (309).

10. A boot canister (309) for a step through type vehicle (100), said boot canister (309) comprising; a central cup shaped structure having an opening (Opening A) (402) for housing a canister (401); a plurality of arms (Opening B & Opening C) extending integrally from a body of said central cup shaped structure, with each arm of said pair of arms having an opening (403, 404) each for accommodating parts (310, 313) associated with the functioning of said canister (401).

11. The boot canister (309) as claimed in claim (10), wherein said one opening (Opening B) (403) accommodates PCV (310) and another opening (Opening C) (404) act as a guiding member for hose purge (313)

12. The boot canister (309) as claimed in claim (10), wherein said Opening A (402) have a projected portion (406) extending from Opening A (402), where said projected portion (406) includes plurality of slots (407, 408).

13. The boot canister (309) as claimed in claim (12), wherein said one slot (407) guides another end of hose PCV (312b) and another slot (408) guides ports of said canister (401)

14. The step through vehicle (100) as claimed in claim 1, wherein said ROV (315) is mounted to fuel tank module (103) by said boot ROV (316) and said bracket ROV (305).

15. The step through vehicle (100) as claimed in claim 1, wherein said hose guide (304) is mounted to said fuel tank module inner portion (302) between said vapor tube (303) and said ROV (315).

16. The boot canister (309) as claimed in claim 12, wherein said canister (401) includes four ports namely Port A, Port B, Port C and Port D.

17. The boot canister (309) as claimed in claim 16, wherein said Port A of said canister (401) is connected to OUT port of said ROV (315), said Port B of said canister (401) is connected to IN port of said PCV (310), said Port C is left open to the atmosphere through said hose drain (308) for draining the liquid fuel and said Port D of said canister (401) is left open to the atmosphere through hose atmosphere (307) .

18. The step through vehicle (100) as claimed in claim 1, wherein said hose atmosphere (307) and said hose drain (308) is routed into said engine mounting bracket (202) and guided by said hose guide (205)