Claims:An empty tank restarting unit (100) for releasing air lock in a vehicle engine during low fuel condition, wherein the unit (100) comprising:
an actuating switch (102),
at least one three-way valve (104) in electrical connection with said actuating switch (102) for actuating the three-way valve (104),
a pump (106) in connection with one of the valves of said three-way valve (104),
at least one-time relay (108) in connection with said pump (106); and
at least one non-return valve (110) in connection with said time relay (108) for actuating the non-return valve (110) for a pre-defined period.

2. The Empty Tank Restarting Unit (100) , as claimed in claim 1, wherein said three-way valve (104) is electrically operable.

3. The Empty Tank Restarting Unit (100) , as claimed in claim 1, wherein said three-way valve (104) is pneumatically operable.

4. The Empty Tank Restarting Unit, as claimed in claim 1, wherein said pump (106) is an electric pump.

5. A method of restarting engine (112) during air lock condition by an Empty Tank Restarting Unit (100) comprising the steps of:
actuating, by an actuating switch (102) of said Empty Tank Restarting Unit (100).
supplying, by a fuel tank (114) which supplies fuel to an Engine (112) through a non-return valve (110).
cranking, by a time relay (108) which cranks said engine (112) after a set period; and
restarting, by a fuel injector pump (116), said engine (112) of the vehicle due to the pressure buildup of fuel at the fuel injector pump (116).

6. The method of restarting engine during air lock condition by an empty tank restart unit (100), wherein said period for cranking the engine is in the range of 30 to 120 seconds.
, Description:TECHNICAL FIELD
[001] The embodiments herein relate to a fuel pumping circuit in vehicles. Further, embodiments herein relate to empty tank restarting unit in vehicles for use during the air lock conditions.

BACKGROUND
[002] A suction type fuel system is used in which fuel flows from a fuel tank to an engine due to the pressure difference between the fuel tank and a fuel injection pump. The fuel tank is operated at an atmospheric pressure while the fuel injection pump is at vacuum pressure. Currently most of the vehicles are facing air lock problem in Common Rail Diesel Injection (CRDI) vehicle due to low fuel level in fuel tank (Below the suction point) and leakage from the low-pressure circuit etc. Due to the air lock concern, vehicle gets shut down. So even after filling of fuel in the fuel tank or checking for leakages in the low-pressure circuit, vehicle does not start due to the air trapped in the low-pressure circuit. To remove the air trapped in fuel lines, CRDI low pressure circuit has a manual priming system and a bleed screw arrangement. After operation of a priming knob provided on the priming system for around 100 strokes, the trapped air is removed from the bleed screw. Thus, clearing air trapped in fuel system. During this air lock scenario, the driver of the vehicle complains about a higher number of strokes required to remove the air. To remove the air lock in vehicle, service person from the vehicle manufacturer or customer care personnel must visit the specific location and solve the issue on vehicle. This leads to extra service cost such as visiting charges, logistic etc. which is paid by the vehicle manufacturer.
[003] Hence, there is a need in the art for a simple, reliable, and easily operable empty tank restarting unit which alleviates the drawbacks of the prior art.
OBJECTS
[004] Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:
[005] An object of embodiments herein is to provide a restarting unit in vehicles which is easily operable by the operator.
[006] Another object of embodiments herein is to provide a restarting unit in vehicle which is simple in construction.
[007] These and other objects of embodiments herein will be better appreciated and understood when considered in conjunction with following description and accompanying drawings. It should be understood, however, that the following descriptions, while indicating embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF DRAWINGS
[008] The foregoing and other features of embodiments of the present invention will become more apparent from the following detailed description of embodiments when read in conjunction with the accompanying drawings. In the drawings, like reference numerals refer to like elements.
[009] Figure 1 represents the schematic view of an empty tank restart circuit in a vehicle according to embodiments as disclosed herein; and
[0010] Figure 2 represents the schematic view of components arranged inside an empty tank restarting unit according to embodiments as disclosed herein.

DETAILED DESCRIPTION
[0011] Embodiments, of the present disclosure, will now be described with reference to the accompanying drawing.
[0012] Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to a person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
[0013] The terminology used, in the present disclosure, is only for the purpose of explaining an embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms "a”, "an”, and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms "comprises”, "comprising”, “including”, and “having”, are open ended transitional phrases and therefore specify the presence of stated features, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, elements, components, and/or groups thereof.
[0014] When an element is referred to as being "mounted on”, “engaged to”, "connected to”, or "coupled to" another element, it may be directly on, engaged, connected or coupled to the other element.
[0015] The terms first, second, third, etc., should not be construed to limit the scope of the present disclosure as the aforementioned terms may be only used to distinguish one element, component, region, or section from another component, region, or section. Terms such as first, second, third etc., when used herein do not imply a specific sequence or order unless clearly suggested by the present disclosure.
[0016] Terms such as “inner”, “outer”, "beneath”, "below”, "lower”, "above”, "upper”, and the like, may be used in the present disclosure to describe relationships between different elements as depicted from the figures.
[0017] The embodiments herein achieve an Empty Tank Restarting Unit (ETRU) (100) in Vehicles. Further, embodiments herein achieve an Empty Tank Restarting Unit (100) in Vehicles, which facilitate proper restarting of the vehicle at low fuel level conditions ensuring reliability. Referring now to the drawings Figures 1 and 2, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0018] Figure 1 depicts a schematic view of the Empty Tank Restarting Unit (100) with other components of a fuel circuit, according to embodiments as disclosed herein. Figure 2 depicts a schematic view of the components arranged inside the Empty Tank Restart Unit (100) , according to embodiments as disclosed herein. During an air lock condition in the vehicle, Empty tank restart unit (ETRU) (100) is turned ON by an actuating switch(102) and engine (112) gets cranked. With this Empty Tank Restart Unit, vehicle gets started without any strokes on priming system (No manual priming required) to remove the air lock. According to an embodiment of the invention referred in Figure 1, the Empty Tank Restarting Unit (100) is located between a Fuel Filter/Fuel Tank (114) and a Fuel Injector Pump (116). The Fuel Injection Pump (FIP) (116) is in connection with a Common Rail (118) and then connected with the Injectors (120) of a conventional Fuel Pumping Circuit Layout.
[0019] In an embodiment of the invention as represented in Figure 2, the components arranged inside the Empty Tank Restarting Unit (100) is shown wherein it includes an actuating switch (102), an Electric Three-Way Valve (104), an Electric Pump (106), a Time Relay (108) and a Non-return Valve (110). The actuating switch (102) acts as an interface between the three-way valve (104) and the pump (106). The time relay (108) is provided to automatically crank the engine (112) after 45 Seconds. It is to be noted the time is adjustable according to various vehicle types. The Non-Return Valve (110) supplies Fuel from the fuel tank (114) to the Fuel Injection Pump (116).
[0020] The method of restarting engine during air lock condition of by the Empty Tank Restarting Unit (100) according to an embodiment of the invention in accordance with easy usability and reliability requirements is as follows. During the air lock condition of the vehicle, the Empty Tank Restarting Unit (ETRU) (100) is turned manually through an actuating switch (102) which supplies fuel to the engine (112) from the fuel tank (114). A time relay (108) is provided in the ETRU (100) which cranks the engine (112) after 45 Seconds, at the same time ETRU (100) continue to supply the fuel from the fuel tank (114) to the Engine (112). After 15 seconds, the engine (112) gets cranked automatically without any priming strokes of the fuel filter (122) due to the pressure build up at the Fuel Injection Pump (116). After the successful cranking of engine (112), the ETRU (100) is turned off manually by the actuating switch (102). Thus, during the air lock condition, the driver/customer must turn on the button (102) of the ETRU (100) which operate for 60 seconds and the engine (112) gets cranked without any priming strokes/efforts.
[0021] The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment, but, are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.
[0022] The present disclosure described herein above has several technical advantages including, but not limited to, the realization of an Empty Tank Restarting Unit in Vehicles that allows at least for:
Automatic restarting of the engine during air lock condition.
Ease of operation of the restarting unit; and
Less Number of Components.
[0023] The disclosure has been described with reference to the accompanying embodiments which do not limit the scope and ambit of the disclosure. The description provided is purely by way of example and illustration.
[0024] The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0025] The foregoing description of the specific embodiments so fully revealed the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
[0026] Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
[0027] Any discussion of devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application. The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values higher/lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary.
[0028] While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiments as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.