Claims:We Claim:
1. A fuel filter (100) in a fuel injection system, said fuel filter 100 configured to be located downstream to a fuel tank (102) and comprising at least:
a housing (104) comprising at least an inlet (105)adapted to receive fuel from said fuel tank (102);
at least one flow passage (103) adapted to receive fuel from said inlet; and
a metallic insert (106) located within said housing (104) and comprising at least one filtration element (108), characterized in that:
a solenoid coil (110) located around said metallic insert (106) in a manner such that energization of said solenoid coil 110 generates a magnetic field around said metallic insert (106).

2. The fuel filter 100 of claim 1, wherein said solenoid coil (110) is integrated with said metallic insert 106.
, Description:Complete Specification:

The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed.
Field of the invention
[0001]This invention relates to the field of fuel filter.

Background of the invention
[0002] A fuel filter is used in a fuel injection system to filter impurities present in the fuel. The fuel filter receives fuel from a fuel tank and filters the fuel. The filtered fuel is then sent to a high pressure pump, common rail and injector. During working of the filter it is observed that very fine metallic particles (approximately of size less than 4 microns) pass through the fuel filter and reach the high pressure pump, common rail and Injector. The deposition of metallic particles on the high pressure pump, common rail and injector affects the overall performance of the fuel injection system.

[0003]Prior art patent application KR20090093207A discloses an oil filter for automatic transmission provided to effectively prevent the abrasion due to the foreign material or the solenoid valve. The oil filter for the auto transmission comprises the frame and the mesh. The frame is assembled inside the case. Partitions are formed inside of frame. A plurality of flow paths is formed by the partitions. The mesh is installed at each flow path of frame. The mesh plays the role of filtering the foreign material included in the working fluid. The magnet is installed at the inner side of the frame. The magnet removes the metal debris included in the working fluid. The magnet is fixed to the inner side of the inside flow path of the frame segmented with the partitions.

Brief description of the accompanying drawing
[0004] Different modes of the invention are disclosed in detail in the description and illustrated in the accompanying drawing:

[0005] FIG. 1 illustrates an exploded view of a fuel filter in a fuel injection system.

Detailed description of the embodiments
[0006] FIG. 1 illustrates a exploded view of a fuel filter 100 in a fuel injection system. The fuel filter 100 is configured to be located downstream to a fuel tank 102 and comprises, a housing 104 comprising at least an inlet adapted to receive fuel from the fuel tank 102, at least one flow passage 103 adapted to receive fuel from the inlet and a metallic insert 106 located within the housing 104. The metallic insert 106 comprises at least one filtration element 108. A solenoid coil is located around the metallic insert 106 in a manner such that energization of the solenoid coil generates a magnetic field around the metallic insert 106. In an embodiment, the solenoid coil may be integrated with the metallic insert 106.

[0007]The constructional features of the fuel filter 100 will be explained in further detail. The fuel filter 100 comprises a housing 104 with an inlet. The inlet receives fuel from a fuel tank 102 via a pipe. From the inlet, fuel flows via a flow passage 103 to reach the metallic insert 106. The metallic insert 106 comprises at least one filtration element 108. A solenoid coil 110 is located around the metallic insert 106. In an embodiment the solenoid coil 110 may be integrated with the metallic insert 106. The solenoid coil 110 is energized during engine cranking. The fuel filter 100 also comprises an outlet. Fuel, after filtration, will flow through the outlet to reach the high pressure fuel injection pump.

[0008]The working of the fuel filter 100 will be explained in further detail. Fuel from the fuel tank 102 flows through a pipe to reach the inlet of the fuel filter 100. The fuel flows via a flow passage 103 into the metallic insert 106. The metallic insert 106 comprises at least one filtration element 108. At the time of cranking of the engine, electric power is supplied to the solenoid coil 110 that is located around the metallic insert 106. When the solenoid coil 110 is energized, a magnetic field is generated around the metallic insert 106. This magnetic field causes metallic particles to get attracted towards the metallic insert 106. Hence the fuel is rendered free from the presence of metallic particles. Upon de-energization of the solenoid coil 110, the accumulated metallic particles may be collected for disposal from the fuel filter 100. Hence, with the use of solenoid coil 110 it is now possible to remove metallic particles present in fuel in the fuel filter 100 itself. This prevents deposition of metallic particles in the high pressure pump, common rail and injector. The above explanation of working of the fuel filter is with respect to the exploded view as disclosed in FIG. 1. A person skilled in the art, would be able to come to the conclusion that the flow passage 103 as disclosed in FIG.1 would be a single flow passage across the housing 104, and metallic insert 106, and the same flow passage would cause the fuel to flow within the fuel filter 100.

[0009]It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention in terms of the type of solenoid used. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.