CLIAMS:We Claim:
1. A fuel delivery pump in a fuel injection system, said pump comprising:
a housing (200) having at least one inlet (202) and at least one outlet (204), said inlet (202) receives fuel from a tank and said outlet (204) opens into a fuel supply line (206);
a piston (208) adapted to reciprocate within said housing (200); and
an element (210) in engagement with said piston (208) and located along the axis of said piston (208).
said fuel delivery pump in contact with an engine mount (212) in a manner such that said element (210) actuates said piston (208) in dependence of the vibration from said engine mount (212).
2. The fuel delivery pump of claim 1, wherein said outlet (204) has a pressure regulating valve.
3. The fuel delivery pump of claim 1, wherein said element (210) is located in between said engine mount (212) and said piston (208).
,TagSPECI:Field of the invention
[001] This invention relates to the field of fuel delivery pump in a fuel injection system.

Background of the invention
[002] A fuel delivery pump, more commonly referred as a feed pump or an electric feed pump, supplies fuel from a fuel tank to a high pressure pump via a fuel filter. The feed pump is usually electrically powered. The internal combustion that receives the fuel produces two kinds of work. The useful work provides power to the vehicle, while a second category of work, for example, heat, vibration, noise etc is also produced that is dissipated to the environment. For efficient energy re-cycling there is a need to convert secondary work into useful work.

[003] Prior art patent US 7823566 discloses a vibration reducing system for an engine is disclosed. The vibration reducing system includes at least one pumping member movable through a plurality of pumping strokes during an engine cycle. The vibration reducing system also includes a controller in communication with the at least one pumping member, the controller being configured to identify a vibration characteristic of the engine. The controller also is configured to adjust the displacement of fuel during at least one of the plurality of pumping strokes based on the vibration characteristic

Brief description of the accompanying drawing
[004] Different modes of the invention are disclosed in detail in the description and illustrated in the accompanying drawing:
[005] FIG. 1 illustrates a fuel injection system; and
[006] FIG. 2 illustrates a fuel delivery pump in a fuel injection system.
Detailed description of the embodiments
[007] FIG. 1 illustrates a fuel injection system. The fuel injection system includes a fuel tank (100). A fuel delivery pump 200 draws in fuel out of tank, and supplies it at a low pressure of 1 bar to, at most, 10 bar, through a fuel line to a fuel filter (102). The proposed fuel delivery pump 200 is placed in between the fuel tank 100 and the high pressure pump 106. The fuel delivery pump receives fuel from the tank by the action of gravity. A further low-pressure line leads from fuel filter (102) to a fuel control unit (104). The function of the fuel control unit (104) is to deliver fuel to a high-pressure pump (106), which compresses the supplied fuel to a high pressure that typically lies between 100 bar and 2000 bar, depending on the system. The high-pressure pump (106) feeds the compressed fuel into a high-pressure line and a rail (108) (high-pressure reservoir) connected to it. A further high-pressure line leads from rail (108) to injector (110). A metering unit (MeUn) which a part of the fuel control unit (104), regulates the amount of fuel that is delivered to the high-pressure pump.
[008] A system of return lines allows excess fuel to flow out of fuel filter (102), high-pressure pump (108), and rail (110), back into fuel tank (100). A pressure control valve (PCV) (112) is connected between rail and return line, the pressure control valve being able to adjust the high pressure prevailing in rail 108 to a constant value by changing the amount of fuel flowing off from rail into return line.
[009] The components of the fuel injection system are controlled by a control unit, which is connected, via electric lines, to electric feed pump (102), high-pressure pump (108), fuel filter (104), injector (112), a pressure sensor at rail, and the pressure control valve (114).
[0010] FIG. 2 illustrates a fuel delivery pump 200 in a fuel injection system. The fuel delivery pump 200 comprises a housing (200) having at least one inlet 202 and at least one outlet 204, the inlet 202 receives fuel from a tank and the outlet 204 opens into a fuel supply line (206). The fuel supply line (206) is in fluid communication with the fuel filter 102. The outlet 204 has a pressure regulating valve. A piston (208) is adapted to reciprocate within the housing (200). An element (210) is in engagement with the piston (208) and located along the axis of the piston (208). The element (210) is located in between the engine mount (212) and the piston (208). The fuel delivery pump 200 is in contact with an engine mount (212) in a manner such that the element (210) actuates the piston (208) in dependence of the vibration from the engine mount (212). The reciprocating motion of the piston (208) within the housing (200), causes the fuel to compress within the housing 200 and open the pressure regulating valve. The function of the pressure regulating valve is to allow fuel to flow from the fuel delivery pump 200 into the line leading to the high pressure pump (106).

[0011] During starting of the engine the fuel injection quantity required is less when compared to engine running at full load condition. When the engine is started the amplitude of vibration is very high, this is sufficient to build the required pressure to pump the fuel from the fuel delivery pump (200). The sources of vibration from the engine may come from but not restricted to, firing pulse, movements of components within the engine and the like. The vibration produced from the engine is then transferred to the element (210) that is located in between the engine mount (212) and the piston (208). Since the engine mount (212) is designed considering a factor of safety into account, the fuel delivery pump 200 will be isolated from high amplitude vibration. The element (210) is designed to consolidate the vibrations generated from the engine into one single resultant force and transmit this force to the piston (208). As the speed of the engine increases the frequency of vibration also increases. This leads to better pumping efficiency of fuel form the fuel delivery pump 200.
[0012] 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 type of element used in the fuel delivery pump. 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.