[0001] The present disclosure, in general, relates to an internal combustion engine for monitoring oil life in internal combustion engine by monitoring oil dilution in an oil sump, and in particular, to a method and a system for monitoring oil dilution in the internal combustion engine equipped with an exhaust after treatment system that require late post injection for regeneration of trapped pollutants.
BACKGROUND
[0002] Background description includes information that may be useful in understanding the present invention.
[0003] Today, the automobile industry highly depends on catalyst-based after-treatment technology to match with exhaust emission regulations. With the three-way converter, oxides of nitrogen (NOx) are reduced into simple nitrogen and carbon-dioxide; and Hydrocarbons and carbon monoxide are oxidized to form water and carbon-dioxide.
[0004] To remove the soot particles or to regenerate the trapped pollutants in the exhaust after treatment system, post injections, such as during late expansion stroke and early exhaust stroke is provided in the combustion chamber. Due to these post injections or late injections of fuel, the fuel hits walls of the combustion chamber/cylinder and seepage into an oil sump having engine oil. The seepage fuel mixes and dilutes the engine oil and reduces viscosity of the engine oil and makes it in-effective to provide necessary lubrication.
[0005] To monitor the fuel seepage into the oil sump, existing technologies provides several ways which includes various components and sensors. One the sensor is the oil sump temperature sensor and oil sump level sensor to monitor or calculate oil dilution level into the oil sump and indicate the same to user to replace the engine oil to avoid damages to the internal combustion engine.
[0006] Problem associated with these existing technologies is the cost where adding an oil sump temperature sensor and oil level sensor will add extra cost to the system and the vehicle.
[0007] In the view of the above-cited problem(s), there is a need for a method and a system that can be implemented in the existing Engine Control Unit (ECU) without addition any sensor or component to avoid increment in price. Further, a system is required that can solve the above mentioned technical problem without additional cost in the existing system and that can use existing sensors and components of the vehicle to monitor and calculate oil dilution.
OBJECTS OF THE DISCLOSURE
[0008] Some of the objects of the present disclosure, which at least one embodiment herein satisfy, are listed hereinbelow.
[0009] It is a general object of the present disclosure to provide an oil dilution calculation system to calculate oil dilution with existing components without addition of any sensor in the oil sump.
[0010] It is another object of the present disclosure to provide a system that has a pre-stored lookup table having experimented data values on a plurality of instances to calculate the oil dilution in the oil sump.
[0011] It is another object of the present disclosure to provide a method and a system to calculate the oil dilution based on a plurality of input parameters that can be obtained from the Engine Control Unit (ECU) and matches the plurality of input parameters to calculate the oil dilution in the oil sump.
[0012] These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description taken in conjunction with the accompanying drawings in which a preferred form of the present invention is illustrated.
SUMMARY
[0013] This summary is provided to introduce concepts related to a system and a method to calculate oil dilution in an oil sump by a plurality of input parameters that are already available with an Engine Control Unit (ECU). The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0014] In an embodiment, the present disclosure relates to an oil dilution calculation system that is configured or embedded in an Engine Control Unit for monitoring oil dilution in oil sump of engine oil in an internal combustion engine. The oil dilution calculation system coupled with a plurality of fuel injectors, and a plurality of sensors which is same as coupling of the ECU with the components of the vehicle through Controller Area Network (CAN) or direct connection. The oil dilution calculation system comprising an oil sump temperature calculation unit to calculate temperature of oil sump and an oil dilution calculation unit to calculate amount of oil dilution. The oil dilution calculation unit coupled with a crank angle sensor to receive an engine speed, a plurality of fuel injectors and fuel injection system to receive total fueling and fueling during first post injection and second post injection, a coolant sensor to receive coolant temperature, an intake air temperature sensor to receive an intake air temperature. The oil dilution calculation unit calculates amount of oil dilution based on input parameters the engine speed, the total fuelling, the first post injection, the second post injection, the coolant temperature, the intake air temperature, calculated engine oil temperature, and engine running time. Further a fuel evaporation calculation unit calculates amount of fuel evaporated from the oil sump and a total oil dilution calculation unit to calculate amount of oil dilution of the engine oil in the oil sump based on the calculated amount of oil dilution and the calculated amount of fuel evaporated.
[0015] In an aspect, the oil sump temperature calculation unit is coupled with the crank angle sensor to receive the engine speed, the plurality of fuel injectors and fuel injection system to receive the total fuelling, the coolant sensor to receive the coolant temperature, an intake air temperature sensor to receive the intake air temperature, an estimated oil temperature at cylinder head location to measure temperature of engine oil at cylinder head, an oil pump to receive oil pressure pump flow, a vehicle speed sensor to receive vehicle speed. The oil sump temperature calculation unit calculates the oil sump temperature based on input parameters the engine speed, the total fuelling, the coolant temperature, the intake air temperature, the oil pressure pump flow, and the vehicle speed.
[0016] In an aspect, the fuel evaporation calculation unit coupled with the crank angle sensor to receive the engine speed; and ECU calculated parameter to estimate engine torque to receive engine torque. The fuel evaporation calculation unit calculates total amount of fuel evaporated based on input parameters the engine speed the oil sump temperature, the engine torque, and the amount of oil dilution.
[0017] In an aspect, a lookup table having predetermined experimented input values and corresponding output values for the input parameters at a plurality of instances is pre-stored in the ECU.
[0018] In another embodiment, the present subject matter relates to a method for calculating oil dilution in oil sump of engine oil in an internal combustion engine. The method comprising: calculating oil sump temperature; calculating oil dilution in the oil sump; calculating fuel evaporated from the oil sump; and calculating total fuel dilution based the calculated amount of oil dilution and the calculated amount of fuel evaporated.
[0019] In an aspect, the calculating the oil sump temperature based on real time input parameters an engine speed, a total fueling, a coolant temperature, an intake air temperature, an oil pressure pump flow, and a vehicle speed.
[0020] In an aspect, the calculating oil dilution in the oil sump based on input parameters an engine speed, a total fueling, a first post injection, a second post injection, a coolant temperature, an intake air temperature, the calculated engine oil temperature, and an engine running time.
[0021] In an aspect, the calculating fuel evaporated from the oil sump based on input parameters the engine speed, the oil sump temperature, the engine torque, and the amount of oil dilution.
[0022] In an aspect, the method is implemented in an Engine Control Unit.
[0023] In an aspect, the Engine Control Unit comprises a lookup table having predetermined experimented input values and corresponding output values for the input parameters at a plurality of instances.
[0024] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.
[0025] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined to form a further embodiment of the disclosure.
[0026] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate exemplary embodiments and, together with the description, serve to explain the disclosed principles. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system and/or methods in accordance with embodiments of the present subject matter are now described, by way of example only, and with reference to the accompanying figures, in which:
[0028] Fig. 1 illustrates architecture ECU having an oil dilution calculation system, in accordance with an embodiment of the present subject matter;
[0029] Fig. 2 illustrates a system architect of Oil dilution calculation system configured in the Engine Control Unit (ECU), in accordance with an embodiment of the present disclosure;
[0030] Fig. 3 illustrates architecture of an oil sump temperature calculation unit of an oil dilution calculation system, in accordance with an embodiment of the present subject matter;
[0031] Fig. 4 illustrates architecture of an Oil dilution unit which is being implemented in an Engine Control Unit (ECU), in accordance with an embodiment of the present subject matter;
[0032] Fig. 5 illustrates architecture of a fuel evaporation calculation unit of the oil dilution calculation system, in accordance with an embodiment of the present subject matter; and
[0033] Fig. 6 illustrates a method for calculating the oil dilution in an internal combustion engine, in accordance with an embodiment of the present disclosure.
[0034] It should be appreciated by those skilled in the art that any block diagrams herein represent conceptual views of illustrative systems embodying the principles of the present subject matter. Similarly, it will be appreciated that any flow charts, flow diagrams, state transition diagrams, pseudo code, and the like represent various processes which may be substantially represented in a computer-readable medium and executed by a computer or processor, whether or not such computer or processor is explicitly shown.
DETAILED DESCRIPTION
[0035] The detailed description of various exemplary embodiments of the disclosure is described herein with reference to the accompanying drawings. It should be noted that the embodiments are described herein in such details as to clearly communicate the disclosure. However, the amount of details provided herein is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the present disclosure as defined by the appended claims.
[0036] It is also to be understood that various arrangements may be devised that, although not explicitly described or shown herein, embody the principles of the present disclosure. Moreover, all statements herein reciting principles, aspects, and embodiments of the present disclosure, as well as specific examples, are intended to encompass equivalents thereof.
[0037] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a", “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises,” “comprising,” “includes” and/or “including,” when used herein, specify the presence of stated features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
[0038] In addition, the descriptions of "first", "second", “third”, and the like in the present invention are used for the purpose of description only, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include at least one of the features, either explicitly or implicitly.
[0039] It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
[0040] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
[0041] Micro-Controller: It is a compact integrated circuit designed to govern a specific operation in an embedded system. A typical microcontroller includes a processor, memory and input/output (I/O) peripherals on a single chip. Generally, microcontrollers are designed to be readily usable without additional computing components because they are designed with sufficient on board memory as well as offering pins for general I/O operations, so they can directly interface with sensors and other components.
[0042] FIG. 1 illustrates an architecture of an Engine Control Unit (ECU) 300 coupled with a plurality of sensor 301 and the internal combustion engine 303. As shown in fig. 4 and 5, the ECU 300 controls and monitor functioning of the internal combustion (IC) engine 303. Existing, the ECU 300 is coupled with a plurality of sensors, such as crank angle sensor to measure engine speed, a plurality of fuel injector to monitor fuel injection into the combustion chamber, a coolant sensor to receive coolant temperature, an intake air temperature sensor to receive temperature of intake air, an oil pump to received pressure of oil flow, vehicle speed sensor to receive speed of vehicle, coupled with pedal to calculate torque of engine. The ECU 300 is coupled with the components and sensors of the vehicle through Control Area Network (CAN) or direct communication.
[0043] As shown in the fig. 1, the ECU 300 comprises an oil dilution calculation system 400 to calculate oil dilution in the oil sump having engine oil in the internal combustion engine. The present system is implemented in the internal combustion engine having exhaust after treatment system having post injections to regenerate trapped pollutants in the exhaust system.
[0044] Referring to fig. 1 and 2, the present subject matter provides the oil dilution calculation system 400 that is implemented in the Electronic Control Unit (ECU) 300 of the vehicle. In another embodiment, the oil dilution calculation system 400 may be embedded in the ECU 300 or installed in the ECU 300. In another embodiment, the oil dilution calculation system 400 may be provided as pre-configured micro-controller to calculate the oil dilution and inform the user via alarm or any indication which is known to a person skilled in the art.
[0045] The oil dilution calculation system 400 includes a processor(s) 402, an interface(s) 404, and a memory 406. In an embodiment, the processor(s) 402, the interface(s) 404, and the memory 406 may be same as of the ECU 300.
[0046] The processor(s) 402 may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, logic circuitries, and/or any devices that manipulate data based on operational instructions.
[0047] Among other capabilities, the one or more processor(s) 402 are configured to fetch and execute computer-readable instructions and one or more routines stored in the memory 406. The memory 406 may store one or more computer-readable instructions or routines, which may be fetched and executed to calculate oil dilution based on a plurality of input parameters. The memory 406 may include any non-transitory storage device including, for example, volatile memory, such as RAM, or non-volatile memory, such as EPROM, flash memory, and the like.
[0048] The interface(s) 404 may include a variety of interfaces, for example, interfaces for data input and output devices referred to as I/O devices, storage devices, various sensors, and the like. The interface(s) 404 may facilitate communication of the oil dilution calculation system 400 with various devices, such as fuel injectors, sensors coupled to the ECU 300. The interface(s) 404 may also provide a communication pathway for one or more components of the oil dilution calculation system 400. Examples of such components include, but are not limited to, processing unit(s) 408 and data 410.
[0049] The processing unit(s) 408 may be implemented as a combination of hardware and programming (for example, programmable instructions) to implement one or more functionalities of the processing module(s) 408. In examples described herein, such combinations of hardware and programming may be implemented in several different ways. For example, the programming for the processing unit(s) 408 may be processor-executable instructions stored on a non-transitory machine-readable storage medium and the hardware for the processing unit(s) 408 may include a processing resource (for example, one or more processors), to execute such instructions. In the present examples, the machine-readable storage medium may store instructions that, when executed by the processing resource, implement the processing unit(s) 408. In such examples, the oil dilution calculation system 400 may include the machine-readable storage medium storing the instructions and the processing resource to execute the instructions or the machine-readable storage medium may be separate but accessible to the oil dilution calculation system 400 and the processing resource. In other examples, the processing unit(s) 408 may be implemented by electronic circuitry.
[0050] In an aspect, the processing unit(s) 408 may include an oil dilution calculation unit 412, a fuel evaporation calculation unit 414, an oil sump temperature calculation unit 416, and a total oil dilution calculation unit 418.
[0051] Further, the data 410 may include data that is either stored or generated as a result of functionalities implemented by any of the components of the processing unit(s) 408. In some aspects, the data 410 may be stored in the memory 406 in the form of various data structures.
[0052] In the present subject matter, a lookup table having a plurality of input parameter which are considered by the oil dilution calculation system 400 to calculate the oil dilution level in the oil sump. The lookup table includes the plurality of input parameters at various instance and corresponding output value. For example, to calculate the oil sump temperature, corresponding the lookup table have input values related to engine speed, total fuelling, coolant temperature, intake air temperature, oil pressure pump flow and vehicle speed. For each of the row from the plurality of rows in the lookup table, a last column may indicate the corresponding output value such as oil sump temperature. Accordingly, based on the input values coming to the ECU 300 an estimation is made regarding the oil sump temperature. Similarly, a lookup table for oil dilution is stored based on the plurality of input parameters for every instance and a lookup table for fuel evaporation is stored based on the plurality of parameters for every instance. Instead of multiple lookup tables, a single lookup table having all necessary information for calculation of oil dilution can be stored in the data 410 or memory 406 of the ECU 300 of the oil dilution calculation system 400. Additionally, data 410 can be organized using data models, such as relational or hierarchical data models. The data 410 may store data, including temporary data and temporary files, generated by the processing unit(s) 408 for performing the various functions of the oil dilution calculation system 400.
[0053] (XAxis = Engine Speed; Y-Axis: Injected fuel qty; Z-Axis: Evaporation Speed) Based upon the engine speed and injected fuel qty, the look up table specifies the evaporation speed of one variable of fuel.
[0054] In dynamic situations with varying engine speed and injected quantities, varying evaporation speed would be there as governed by the pre-defined look-up table.
[0055] Figs. 3, 4, and 5 illustrate implementation of each unit for calculating their corresponding data based on the plurality of input parameters from the lookup table.
[0056] In operation, when the fuel is getting seepage into the oil sump and mixes with the engine oil. As shown in fig. 3, the oil dilution calculation system 400 comprising the oil sump temperature calculation unit 416 calculates oil sump temperature or temperature of engine oil in the oil sump. The oil sump temperature calculation unit 416 receives the input parameters the engine speed 101, total fuelling 102, coolant temperature 103, intake air temperature 104, estimated engine oil temperature at cylinder head 105, an oil pressure pump flow 110 and vehicle speed 111. As all these input parameters are already available to the ECU 300, the oil sump temperature calculation unit 416 uses the same to calculates the temperature of the oil sump to avoid requirement of separate temperature sensor in the oil sump. It saves cost as well. The oil sump temperature calculation unit 416 maps the received inputs parameters with the pre-stored input parameter values in the lookup table. Upon mapping, the oil sump temperature calculation unit 416 determine/calculate/select the temperature of the oil sump at that moment. The oil sump temperature calculation unit 416 gives the calculated oil sump temperature 217 to the oil dilution calculation unit 412 and the fuel evaporation calculation unit 414 for further processing.
[0057] Referring to fig. 4, the oil dilution calculation unit 412 calculates total amount of oil dilution 413 in the oil sump. The oil dilution calculation unit 412 receives the input parameters like the engine speed 101, total fuelling 102, coolant temperature 103, intake air temperature 104, calculated oil sump temperature 417, fuel during first post injection 106 which during late expansion stroke, fuel during second post injection 107 which is during early exhaust stroke, engine running time 108, and initial engine oil weight 109. To determine oil dilution and to check total oil, initial oil weight is required which is predefined with respect to engine capacity.
[0058] As all these input parameters are already available to the ECU 300, the oil dilution calculation unit 412 uses the same to calculates the oil dilution in the oil sump. The oil dilution calculation unit 412 maps the received inputs parameters with the pre-stored input parameter values in the lookup table. Upon mapping, the oil dilution calculation unit 412 determines/calculates/selects the oil dilution at that moment. The oil dilution calculation unit 412 gives the calculated total amount of oil dilution 413 to the total dilution calculation unit 418 for further processing.
[0059] Referring to fig. 5, the fuel evaporation calculation unit 414 calculates total amount of fuel evaporate 415 from the oil sump. The fuel evaporation calculation unit 414 receives the input parameters like the engine speed 101, the calculated oil sump temperature 417, engine torque 110, and quantity of oil diluted 413 in the oil sump. The fuel evaporation calculation unit 414 maps the received inputs parameters with the pre-stored input parameter values in the lookup table. Upon mapping, the fuel evaporation calculation unit 414 determines/calculates/selects the total amount of fuel evaporated 415 at that moment. The fuel evaporation calculation unit 414 gives the total amount of fuel evaporated 415 to the total dilution calculation unit 418 for further processing.
[0060] Referring to fig. 2, the total oil dilution calculation unit 418 calculates the total oil dilution 419 by subtracting the total amount of fuel evaporated 415 from the total amount of fuel diluted or total amount of oil dilution 413.
[0061] If the total dilution 419 is greater than a predefined threshold oil dilution value ‘Thoil’, the total oil dilution calculation unit 418 generates an alarm signal to the user to replace the engine oil. The threshold oil dilution value ‘Thoil’ is pre-stored in the memory of the system 400.
[0062] FIG. 6 illustrates a method 500 for monitoring or calculating total oil dilution in the oil sump of the internal combustion engine. The order in which the method 500 is described is not intended to be construed as a limitation, and any number of the described method blocks can be combined in any appropriate order to carry out the method 500 or an alternative method. Additionally, individual blocks may be deleted from the method 500 without departing from the scope of the subject matter described herein.
[0063] At block 502, the method includes calculating oil sump temperature based input parameters from an engine speed 101, a total fuelling 102, a coolant temperature 103, an intake air temperature 104, an oil pressure pump flow 110, and a vehicle speed 111. The oil sump temperature is calculated in accordance with the pre-stored lookup table.
[0064] At block 504, the method includes calculating amount of oil dilution in the oil sump based on input parameters an engine speed 101, a total fuelling 102, a first post injection 106, a second post injection 107, a coolant temperature 103, an intake air temperature 104, the calculated engine oil temperature 105, and an engine running time 108. The oil dilution is calculated in accordance with the pre-stored lookup table.
[0065] At block 506, the method includes calculating amount of fuel evaporated from the oil sump based on input parameters the engine speed, the calculated oil sump temperature, the engine torque, and the amount of oil dilution.
[0066] At block 508, the method includes calculating total fuel dilution based the calculated amount of oil dilution and the calculated amount of fuel evaporated.
[0067] In an aspect, when the total dilation in the oil sump is greater than a predefined threshold value, the system generates an alarm signal to indicate the user to replace the engine oil as engine oil is contaminated with the fuel and lost its viscosity.
Technical advantages:
[0068] With the present system implemented in the Engine Control Unit (ECU), total oil dilution is calculated without addition of a separate sensor in the oil sump or level indicator sensor in the oil sump.
[0069] With the present ECU and existing input parameters available to ECU, the present system does not require any other parameter which require separate communication with the ECU, therefore, it saves cost and no change in the architecture of the ECU is required.
[0070] With the present disclosure, there is no need to add any extra component in the system to calculate the oil dilution.
[0071] With the present system, the existing hardware works in more efficient and technically advance way to calculate oil dilution based on the existing parameters.
[0072] The above description does not provide specific details of the manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art can choose suitable manufacturing and design details.
[0073] It should be understood, however, that all of these and similar terms are to be associated with the appropriate physical quantities and are merely convenient labels applied to these quantities. Unless specifically stated otherwise, as apparent from the discussion herein, it is appreciated that throughout the description, discussions utilizing terms such as “receiving,” or “determining,” or “retrieving,” or “controlling,” or “comparing,” or the like, refer to the action and processes of an electronic control unit, or similar electronic device, that manipulates and transforms data represented as physical (electronic) quantities within the control unit’s registers and memories into other data similarly represented as physical quantities within the control unit memories or registers or other such information storage, transmission or display devices.
[0074] Further, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
[0075] It will be appreciated that variants of the above-disclosed and other features and functions, or alternatives thereof, may be combined into many other different systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims.
[0076] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.

Claims:We claim:
1. An oil dilution calculation system (400) configured in an Engine Control Unit (300) for monitoring oil dilution in oil sump of engine oil in an internal combustion engine, the oil dilution calculation system (400) coupled with a plurality of fuel injectors, and a plurality of sensors, the oil dilution calculation system (400) comprising:
an oil sump temperature calculation unit (416) to calculate temperature of oil sump (417);
an oil dilution calculation unit (412) coupled with:
a crank angle sensor to receive an engine speed (101),
a plurality of fuel injectors and fuel injection system to receive total fueling (102) and fueling during first post injection (106) and second post injection (107),
a coolant sensor to receive coolant temperature (103),
an intake air temperature sensor to receive an intake air temperature (104),
the oil dilution calculation unit (412) calculates amount of oil dilution (413) based on input parameters the engine speed (101), the total fueling (102), the first post injection (106), the second post injection (107), the coolant temperature (103), the intake air temperature (104), calculated engine oil temperature (105), and engine running time (108);
a fuel evaporation calculation unit (414) calculates amount of fuel evaporated (415) from the oil sump; and
a total oil dilution calculation unit (418) to calculate amount of oil dilution (419) of the engine oil in the oil sump based on the calculated amount of oil dilution (413) and the calculated amount of fuel evaporated (415).
2. The oil dilution calculation system (400) as claimed in claim 1, wherein the oil sump temperature calculation unit (416) coupled with:
the crank angle sensor to receive the engine speed (101);
the plurality of fuel injectors and fuel injection system to receive the total fueling (102);
the coolant sensor to receive the coolant temperature (103),
an intake air temperature sensor to receive the intake air temperature (104),
an estimated engine oil temperature at cylinder head (105) to measure temperature of engine oil at cylinder head; an oil pump to receive oil pressure pump flow (110);
a vehicle speed sensor to receive vehicle speed (111); and
the oil sump temperature calculation unit (416) calculates the oil sump temperature (417) based on input parameters the engine speed (101), the total fueling (102), the coolant temperature (103), the intake air temperature (104), the oil pressure pump flow (110), and the vehicle speed (111).

3. The oil dilution calculation system (400) as claimed in claim 1, wherein the fuel evaporation calculation unit (414) coupled with:
the crank angle sensor to receive the engine speed (101, 301); and
engine torque (303) is estimated,
the fuel evaporation calculation unit (414) calculates total amount of fuel evaporated (415) based on input parameters the engine speed (101, 301), the oil sump temperature (205), the engine torque (303), and the amount of oil dilution (201).

4. The oil dilution calculation system (400) as claimed in claim 1, wherein a lookup table having predetermined experimented input values and corresponding output values for the input parameters at a plurality of instances is pre-stored in the ECU (300).

5. A method (500) for calculating oil dilution in oil sump of engine oil in an internal combustion engine, the method (500) comprising:
calculating (502) oil sump temperature (205);
calculating (504) oil dilution (201) in the oil sump;
calculating (506) fuel evaporated (203) from the oil sump; and
calculating (508) total fuel dilution (302) based the calculated amount of oil dilution (413) and the calculated amount of fuel evaporated (415).

6. The method (500) as claimed in claim 5, wherein the calculating (502) the oil sump temperature (417) based on input parameters an engine speed (101), a total fueling (102), a coolant temperature (103), an intake air temperature (104), an oil pressure pump flow (110), and a vehicle speed (111).

7. The method (500) as claimed in claim 5, wherein the calculating (504) the oil dilution (413) in the oil sump based on input parameters an engine speed (101), a total fueling (102), a first post injection (106), a second post injection (107), a coolant temperature (103), an intake air temperature (104), the calculated engine oil temperature (105), and an engine running time (108).

8. The method (500) as claimed in claim 5, wherein the calculating (506) the fuel evaporated (415) from the oil sump based on input parameters the engine speed (101, 301), the oil sump temperature (205), the engine torque (303), and the amount of oil dilution (201).

9. The method (500) as claimed in claim 5, wherein the method (500) further comprises generating an alarm signal when the oil dilution (419) is greater than a predefined threshold oil dilution value.

10. The method (500) as claimed in claim 5, wherein the method (500) is implemented in an Engine Control Unit (300), where the Engine Control Unit (300) comprises a lookup table having predetermined experimented input values and corresponding output values for the input parameters at a plurality of instances.