:We Claim:

1. Integrated assembly 100 for evaporative emission control in a vehicle; said integrated assembly 100 comprising,
A canister 101; said canister 101 adapted to collect fuel vapor from a fuel tank 105;
A purge valve 102; said purge valve 102 adapted to purge said fuel vapors collected in said canister 101 to an intake manifold 104 of an engine; and
A control unit 103; said control unit 103 adapted to operate said purge valve 102 based on a predetermined engine operating conditions.

2. An integrated assembly 100 as claimed in claim 1, wherein said canister 101 is filled with activated carbon which absorbs said fuel vapors.

3. An integrated assembly 100 as claimed in claim 1, wherein atmospheric air from check valve 106 is allowed to pass through said canister 101 to purge said fuel vapors from said canister 101 into said intake manifold 104 of an engine.

4. An integrated assembly 100 as claimed in claim 1, wherein said purge valve 102 is solenoid operated.

5. An integrated assembly 100 as claimed in claim 1, wherein said predetermined engine operating conditions are based on engine pressure and engine load requirement.

6. An integrated assembly 100 as claimed in claim 1, wherein said canister 101, said purge valve 102 and said control unit 103 are enclosed within a common housing 107.
7. An integrated assembly 100 as claimed in claim 1, wherein said integrated assembly 100 is a part of said fuel tank 105. ,TagSPECI:The following specification particularly describes the invention and the manner in which it is to be performed.

Field of the invention:

[001] The present invention relates to an integrated assembly for evaporative emission control in a vehicle.

Background of the invention:

[002] For gasoline vehicles, due to increase in ambient temperature the fuel in the tank may get evaporated. In systems with electronic fuel injection systems, there may be a purge valve to purge the fuel vapors from the tank into the intake manifold. However in present carburetor based fuel supply systems evaporated fuel from fuel tank is released into atmosphere through breather since there is no means for electronically controlled purging. Hence meeting the evaporative emission legislations with present fuel tank architecture is difficult for carburetor based vehicles. Purge control systems to purge the fuel vapors collected in a canister, are known in the prior arts.

[003] The patent application JP-2012026332 discloses one such evaporative fuel purging system for a vehicle with electronic fuel injection system.

[004] The patent application KR 2012051454 discloses fuel vapor treating apparatus for vehicle having a canister collecting fuel evaporating gas generated in fuel tank, a purge control solenoid valve performing purge control of gas, and controller controlling shutoff valve and solenoid valve. The apparatus has a controller for opening and closing a steam trap and connected with a canister. The canister collects fuel evaporating gas a purge control solenoid valve performs purge control to the canister. The controller controls the shutoff valve and the purge control solenoid valve.

Brief Description of the Invention:

[005] The invention relates to an integrated assembly for evaporative emission control in a vehicle. The integrated assembly comprises a canister which is adapted to adsorb fuel vapors from a fuel tank. Further the integrated assembly comprises a purge valve adapted to the purge fuel vapors adsorbed in the canister to an intake manifold of an engine and a control unit adapted to operate the purge valve based on predetermined engine operating conditions. The purge valve, the canister and the control unit of the integrated assembly is enclosed in the common housing.

[006] The device in accordance with the present invention is simple in construction and easy to mount on a vehicle as all elements are integrated in a common assembly.

Brief Description of the accompanying drawing:

[007] An exemplifying embodiment of the invention is explained in principle below with reference to the following drawing

[008] Figure 1 illustrates an integrated assembly (100) for evaporative emission in a vehicle.

Detailed Description of the invention:

[009] Figure 1 illustrates an integrated assembly (100) for evaporative emission in a vehicle in accordance with one embodiment of the invention.

[0010] In accordance with one embodiment of an invention, figure 1 shows an integrated assembly (100) for evaporative emission control in a vehicle. The integrated assembly (100) comprises a canister (101) which is adapted to adsorb fuel vapors from a fuel tank (105). Further the integrated assembly comprises a purge valve (102) which is adapted to purge the fuel vapors adsorbed in the canister (101) to an intake manifold (104) of an engine and a control unit (103) which is adapted to operate the purge valve (102) based on predetermined engine operating conditions.

[0011] According to an embodiment of an invention the canister (101), the purge valve (102) and the control unit (103) are enclosed within a common housing (107).

[0012] According to an embodiment of an invention the canister (101) is filled with activated carbon which adsorbs the fuel vapors when the fuel vapor passes from the fuel tank (105) to the canister (101).

[0013] In the integrated assembly (100) for evaporative emission control in a vehicle the fuel in the fuel tank (105) vaporizes and the fuel vapor formed in the space above the fuel level moves from fuel tank (105) to canister (101) which is filled with activated carbon and the activated carbon adsorbs these fuel vapors. The fuel vapors stored in the canister (101) can be released back into intake manifold of the engine under certain engine operating conditions.

[0014] According to an embodiment of the invention there is a check valve (106) which allows fresh atmospheric air into the canister (101) when purging is to be done. The atmospheric air enters the integrated assembly through a check valve (106). The atmospheric air is allowed to pass through the canister (101) to purge the fuel vapors from the canister (101) into the intake manifold (104) of an engine. This check valve (106) allows the air to flow only in one direction i.e. from atmosphere to canister (101).

[0015] The predetermined engine operating conditions on which the control unit (103) works are
based on the pressure of the intake manifold of engine and engine load requirement.

[0016] During engine operation the pressure sensors are used to sense the pressure of the intake manifold (104) of an engine and the pressure sensors provides the input to the control unit (103). Depending upon the engine load requirement and the pressure in the intake manifold of engine, the control unit (103) operates the purge valve (102).

[0017] According to an embodiment of an invention the purge valve (102) is a solenoid operated.

[0018] Here the purge valve is present inside the canister (101) based on the signal given by control unit (103) the purge valve operates the solenoid comprises the solenoid coil assembly, the magnetic core, the magnetic pot, the armature and the spring attached to armature. The control unit (103) triggers the solenoid that creates a magnetic field around the solenoid circuit. This magnetic field will produce the magnetic force which reciprocates the armature in downward direction against the spring force to close the air gap between the armature and the magnetic core. The movement of armature creates a passage between the purge valve (102) and the intake manifold (104) of an engine by purging the fuel vapor to the intake manifold (104) of an engine. The solenoid controls the quantity and rate of fuel vapors being released to the intake manifold (104) of an engine. The solenoid is operated by a variable frequency duty cycle control signal.

[0019] According to an embodiment of an invention the integrated assembly (100) is a part of fuel tank (105). Within the fuel tank (105) the integrated assembly (100) is positioned near the operative top surface of the fuel tank (105) so that the fuel vapors are absorbed within the fuel tank (105) as the fuel vapors rise upwards.

[0020] According to an embodiment of an invention, the integrated assembly (100) is a part of fuel tank (105). The integrated assembly (100) is positioned outside the fuel tank (105) so that the fuel vapors are absorbed outside the fuel tank (105) and goes to the canister (101) as the fuel vapors rise upwards inside the fuel tank (105).

[0021] There are several advantages with the invention disclosed above. As this invention is the integrated assembly (100) for evaporative emission control in a vehicle it eliminates the interface of small parts which in turn helps in reduction in cost hence making this invention a cost effective.

[0022] It must be understood that the embodiments explained in the above detailed description in only illustrative and does not limit the scope of this invention. The scope of this invention is limited only by the scope of the claims. Many modification and changes in the embodiments aforementioned are envisaged and are within the scope of this invention.