Claims:We Claim:
1. A cooling system (200) for a fuel tank (105) of a fuel injection system (100), said cooling system (200) comprising:
-a temperature sensor (205) for detecting a fuel temperature within said fuel tank (105), wherein said cooling system (200) maintains said fuel temperature below a control temperature;
-an electric feed pump (210) located in said fuel tank, said electric feed pump (210) triggered by fuel temperature detected by said temperature sensor (205);
-a cooling pipe (220), said cooling pipe (220) having a first end (220a) attached to said electric feed pump (220) and a second end (220b) opening to said fuel tank (105), said cooling pipe (220) adapted to circulate fuel such as to lower the temperature of said fuel; and
- a control module (215) in signal communication with said temperature sensor (205) and said electric feed pump (210).

2. The cooling system (200) as claimed in claim 1, wherein said cooling pipe (220) is arranged in straight or serpentine configuration.

3. The cooling system (200) as claimed in claim 1, wherein in said straight configuration fuel is circulated through the cooling pipe (220) to a radiator (225).

4. The cooling system (200) as claimed in claim 1, wherein in said serpentine configuration fuel is circulated through the cooling pipe (220) around the fuel tank (105).

5. A method for cooling a fuel tank (105) of a fuel injection system (100), said method comprising:
-detecting a fuel temperature within said fuel tank (100) by a temperature sensor (205);
- monitoring the temperature sensor (205) by a control module (215), wherein said control module (215) is in signal communication with said temperature sensor (205);
- determining if said fuel temperature is above a control temperature by said control module (215);
- generating an activation signal, by said control module (215), if said fuel temperature is above said control temperature;
- activating an electric feed pump (210) if said activation signal is generated, wherein said electric feed pump (210) is in signal communication with said control module (215); and
-cooling said fuel flowing through a cooling pipe (220).

6.The method as claimed in claim 4, said method comprising generating a deactivation signal by said control module (215) if said temperature sensor (205) indicates said fuel temperature is below said control temperature, wherein said deactivation signal deactivates said electric feed pump (215).
, 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] The present disclosure relates to a cooling system for cooling fuel in fuel tank of a fuel injection system and a method for cooling fuel in a fuel tank of a fuel injection system.
Background of the invention
[0002] In the operation of a diesel engine it is known that substantially more fuel is conveyed by the fuel supply pump than is supplied by the injection pump into the engine for use in combustion. The excess fuel which also serves to cool the injection pump flows back into the fuel tank.
[0003] In such an operating system the fuel flowing through the injection circuit is heated to a considerable extent. While a diesel engine run on heated fuel seems to lose power, in fact the power of the engine decreases because the heated injected fuel supplies less energy when the injected volume is the same instead of being weight-adjusted. Further, the cooling function of the injection circuit is lost to the injection pump. This increase in temperature of fuel leads to change in viscosity of the fuel which further leads to C-Coating peel off in roller shoe & slip of roller leading to drive train failure.
[0004] Therefore, it has been attempted to conduct the cooling of the fuel through a cooling system located in the fuel tank.

Brief description of the accompanying drawings
[0005] An embodiment of the disclosure is described with reference to the following accompanying drawings,
[0006] Figure 1 illustrates a view of the fuel injection system in accordance with an embodiment of our invention.
[0007] Figure 2 illustrates a magnified view of an embodiment of our invention.
Detailed description of the drawings
[0008] Figure 1 illustrates a fuel injection system (100) with one embodiment of our invention (200). The fuel injection system (100) comprises among other things at least a fuel tank (105), for the storage and flow of pressurized fuel.
[0009] Figure 2 illustrates a sectional view of the fuel injection system (100) with one embodiment of our invention (200). In this embodiment, the fuel tank (105) consists of a temperature sensor (205). The temperature sensor (205) constantly monitors the temperature of the fuel in the fuel tank (105).
[0010] In another embodiment of the invention, the temperature sensor can also be located in the pipe, just before the pipe connects the fuel pump (115) to the fuel filter (110).
[0011] The temperature sensor (205) communicates with the control module (215) of the fuel injection system (100) via signal communication. The control module (215) contains predetermined threshold of fuel temperature, known as control temperature, fed into it. When the temperature of the fuel in the fuel tank (105) goes above said control temperature, the control module (215) generates an activation signal.
[0012] The activation signal generated by control module (215) activates an electric feed pump (210) connected to control module (215) that again communicates via signal communication. The electric feed pump (210) is further connected to a cooling pipe (220), which has one end (220a) of it connected to said electric feed pump (210) and a second end (220b) connected to said fuel tank (105).
[0013] When the activation signal activates the electric feed pump (210), the fuel flows through the cooling pipe (220) from the electric feed pump (210) back into the fuel tank (105). The configuration of the cooling pipe (220) can either be straight or serpentine based on the vehicle layout and space availability. The length of said cooling pipe (220) is dependent of the cooling surface area needed. In another embodiment, the cooling pipe (220) is arranged along a lowermost surface (105a) of said fuel tank (105).
[0014] In close proximity of the cooling pipe (220), a radiator (225) is placed. This radiator (225) can either be the already existing radiator of the vehicle, or it can be a new radiator introduced for the sake of the cooling system (200). When the fuel flows through the cooling pipe (220), the radiator (225) placed along one side of the cooling pipe (220). The radiator (225) contains a coolant liquid. The radiator (225) cools the fuel down by taking heat out of the cooling pipe (220), cooling it down with air. Liquid coolant circulates around the metal of the radiator (225), this liquid absorbs the heat from the cooling pipe (220) and then is pumped into the radiator (225) where it passes through thin pipes.
[0015] In another embodiment, the radiator (225) can be replaced by an ac duct.
[0016] In another embodiment, the cooling of the fuel can also be done by convection, by normally passing the heated fuel through the cooling pipe (220). The travel of the fuel through the cooling pipe (220) enables it to dissipate the heat in the fuel through convection thereby requiring neither a radiator (225) nor an ac duct.
[0017] This process continues until the temperature of the fuel falls to the control temperature. Once the control temperature is reached, the temperature sensor (205) triggers a signal to the control module (215). Once control temperature is reached, the control module (215) triggers a deactivation signal to the electric feed pump (210), thereby stopping the process.
[0018] It must be understood that the embodiments explained in the above detailed description are only illustrative and do not limit the scope of this invention. Any modification to the fuel injection system (100) are envisaged and form a part of this invention. The scope of this invention is limited only by the claims.