FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
AND
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
TITLE OF THE INVENTION
A SYSTEM CALIBRATING ENGINE AND TRANSMISSION OF A VEHICLE FOR CONFIGURING DIFFERENT DRIVE MODES
APPLICANT
TATA MOTORS LIMITED
of Bombay House, 24 Homi Mody Street,
Hutatma Chowk, Mumbai 400 001,
Maharashtra, India
INVENTOR
SANTOSH GOSAVI
An Indian National
of Tata Motors Limited
of Bombay House, 24 Homi Mody Street,
Hutatma Chowk, Mumbai 400 001,
Maharashtra, India
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed. 2

FIELD OF INVENTION
The present disclosure generally relates to field of automobile engineering. Particularly but not exclusively, the present disclosure relates to a system for calibrating engine and transmission of a vehicle for configuring different drive modes thereof based on requirements.
BACKGROUND OF INVENTION
Generally, a vehicle is configured to operate in a single drive mode, for instance, the conventional vehicles are configured to operate either as a sports car or an economy car. Specifically, engine and transmission will be tuned or calibrated to operate in a specific way only, i.e. in a single mode irrespective of the conditions governing vehicle performance and fuel economy. With increase in fuel prices and specific customer requirements, such as need for engines with high power, performance and output suiting driving requirements, there is a need for a system that changes operating configuration of engine and transmission to achieve a particular combination of engine and transmission calibration curves/maps, i.e. changes modes to meet specific requirements.
However, the conventionally known engines and transmission do not exhibit flexibility to change mode according to the requirement. Particularly, the conventionally known engines and transmission do not change operating configuration thereof based on dynamically changing driving conditions. Further, the conventionally known engine and transmission are incapable of adapting to the actual driving conditions, thereby the service life of the engine and transmission is reduced, maintenance frequency and maintenance cost is increased. Although, few multi-drive mode systems are available, however, the conventionally known multi-drive mode systems fail to achieve optimum fuel efficiency and vehicle performance. Further, the conventional multi-drive mode systems do not have any provision for positively indicating the selected drive mode to the occupant of the vehicle. Further, the conventionally known multi-3

drive mode systems involve complex operations, and require constant attention of the driver that may divert driver’s attention from driving and can cause accidents.
Accordingly, there is a need for a system for calibrating engine and transmission of a vehicle for configuring drive modes thereof system that achieves optimum fuel efficiency and vehicle performance. Furthermore, there is a need for a multi-mode drive system that positively indicates current drive mode to the occupant of the vehicle. Still further, there is a need for multi-mode drive system that can operate in manual as well as automatic mode, thereby eliminating the need for constant driver attention.
OBJECTS OF THE INVENTION
One object of the present disclosure is to provide a system for calibrating engine and transmission of a vehicle for configuring different vehicle drive modes that achieves optimum fuel economy and vehicle performance compared to the conventional multi-mode drive systems.
Another object of the present disclosure is to provide a system for calibrating engine and transmission to achieve a particular combination of engine and transmission calibration curves/maps for achieving optimum fuel economy and vehicle performance.
Yet another object of the present disclosure is to provide a system for calibrating engine and transmission that can operate in manual as well as automatic mode, thereby eliminating the need for constant driver attention.
Still another object of the present disclosure is to provide a system for calibrating engine and transmission for configuring different vehicle drive modes that positively indicates current drive mode to the occupant of the vehicle. 4

Yet another object of the present disclosure is to provide a system for calibrating engine and transmission for all possible vehicle applications based on the customer requirements, thereby ensuring optimum fuel efficiency and vehicle performance in all real world driving conditions.
Another object of the present disclosure is to provide a system for calibrating engine and transmission for configuring different vehicle drive modes that improves aggregate service life of the powertrain.
Yet another object of the present disclosure is to provide a system for calibrating engine and transmission for configuring different vehicle drive modes that restrains vehicle abuse and reduces maintenance frequency and maintenance cost.
Still another object of the present disclosure is to provide a system for calibrating engine and transmission for configuring different vehicle drive modes that is reliable, systematic and convenient to use and configure.
Another object of the present disclosure is to provide a system for calibrating engine and transmission for configuring different vehicle drive modes that ensures swift and controlled drive mode change, thereby enhancing driving control, occupant comfort and safety.
SUMMARY OF THE INVENTION
The shortcomings of the prior art are overcome and additional advantages are provided through the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
In an embodiment of the present disclosure, a system (100) for calibrating an engine and a transmission of a vehicle for configuring different vehicle drive modes is disclosed. The system (100) includes at least one memory storage unit 5

and at least one controller (10). The memory storage unit stores a plurality of calibration curves/maps for the engine and transmission. The controller (10) facilitates calibration of the engine “E” and the transmission “T” to define a current drive mode, wherein selection of the combination of the engine and transmission calibration curves/map is based on current vehicle loading condition and vehicle operating terrain to achieve optimum fuel efficiency and performance of the vehicle.
Specifically, the controller is a Body Control Module (BCM).
Further, the system includes a selection switch (50) to switch the system (100) between an automatic mode and a manual mode.
In accordance with an embodiment, the system includes a user interface (30) to facilitate manual selection of a particular combination of engine and transmission calibration curves/map by a driver of the vehicle based on perceived vehicle loading condition and terrain to define the manual mode.
In accordance with another embodiment, the system further includes a load sensing module and a navigation module that detects the current vehicle loading condition and the vehicle operating terrain respectively, based on the current vehicle loading condition and terrain detected, the controller (10) facilitates automatic selection of particular combination of engine and transmission calibration curves/map and calibration of the engine and the transmission accordingly to define the automatic mode.
Typically, the load sensing module utilize either of already available Automatic Load Sensing Valve (ALSV) and Load Sensing Pressure Valve (LSPV) integrated in a brake circuit of the vehicle along with a pressure sensor to determine vehicle loading condition, wherein either of the Automatic Load Sensing Valve (ALSV) and the Load Sensing Pressure Valve (LSPV) regulates pressure in a rear brake 6

circuit based on the axle load, and vehicle loading condition is determined based on change in pressure in the rear brake circuit.
The load sensing module, the load sensing module “N”, the terrain condition sensing module, the controller (10), the engine, the transmission, the display unit are communicably coupled to each other through a network.
Typically, the network is a Controller Area Network (CAN).
Alternatively, the network is a wireless network.
In accordance with another embodiment, the network is a wired network.
Specifically, the Body Control module (10) directly communicates with the engine and the transmission to select the relevant calibration curve/map to define the current drive mode.
Alternatively, the Body Control module (10) facilitates the selection of calibration curve/map of the engine and the transmission through an engine and transmission management module (40) to define the current drive mode.
Generally, the display unit (20) is the infotainment system of the vehicle.
Alternatively, the display unit (20) is the instrument panel of the vehicle.
In accordance with an embodiment of the present disclosure, a manual method for calibrating an engine and a transmission of the vehicle for configuring drive modes of the vehicle is disclosed. The manual method includes the steps of storing a plurality of calibration curves/maps for the engine and transmission by a memory storage unit, manually selecting a particular combination of engine and transmission calibration curves/map based on current perceived vehicle loading condition and vehicle operating terrain by a user, thereafter calibrating the engine 7

“E” and the transmission “T” based on the selection to define a current drive mode by a controller and finally displaying and indicating the current drive mode to vehicle occupant by a display unit.
In accordance with an embodiment of the present disclosure, an automatic method for calibrating an engine and a transmission of the vehicle for defining drive modes of the vehicle is disclosed. The automatic method includes the steps of storing a plurality of calibration curves/maps for the engine and transmission by a memory storage unit, detecting current vehicle loading condition and vehicle operating terrain by a load sensing module and a navigation module respectively, selecting a particular combination of engine and transmission calibration curves/map based on detected current vehicle loading condition and vehicle operating terrain by a controller, thereafter calibrating of the engine “E” and the transmission “T” based on the selection to define a current drive mode by the controller, and finally displaying and indicating the current drive mode to vehicle occupant by a display unit.
BRIEF DESCRIPTION OF DRAWINGS
The disclosure itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:
FIG. 1 illustrates a block diagram depicting selection of engine and transmission calibration curves/maps based on different vehicle loading and terrain conditions in accordance with an embodiment of the present disclosure;
FIG. 2 illustrates a block diagram depicting interaction between various elements of a manual system for selection of calibration curves/maps of engine and 8

transmission of a vehicle for configuring different drive modes based on vehicle loading and terrain conditions; and
FIG. 3 illustrates a block diagram depicting interaction between various elements of an automatic system for selection of calibration curves/maps of engine and transmission of a vehicle for configuring different drive modes based on vehicle loading and terrain conditions.
FIG. 4 illustrates a characteristic curve of a typical automatic load sensing valve (ALSV) or load sensing pressure valve (LSPV) used for detecting vehicle loading in case of the automatic system of FIG. 3; and
FIG. 5 illustrates a block diagram depicting operation of the system in either one of automatic and manual mode or combination of automatic and manual mode, wherein combination of manual and automatic calibration selection mode can be achieved with features of the both the processes integrated together.
DETAILED DESCRIPTION OF INVENTION
The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with 9

the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.
The present disclosure generally relates to a system for calibrating engine and transmission of a vehicle for achieving different combinations of engine and transmission calibration curves/map for configuring different vehicle drive modes. The engine and transmission is calibrated based on current vehicle loading condition and terrain to attain optimal fuel efficiency and vehicle performance. Typically, the system includes a selection switch to switch the system between an automatic mode and a manual mode, the system when operating in manual mode is hereinafter referred to as “manual system” and the system when operating in automatic mode is referred to as “automatic system”.
As more than one engine calibration curves/maps can be stored in engine control unit (ECU) and considering that the engine and automatic (AT & AMT) transmission calibration can be optimized for higher fuel efficiency and vehicle performance for the given vehicle application, automatic or manual selection of appropriate combinations of engine and transmission calibration curves/maps based on loading condition and operating terrain to achieve optimal fuel efficiency and vehicle performance is proposed. Different loading condition such as un-laden, part load, rated load and overload and driving the vehicle in different vehicle terrains such as hilly roads, highways, city roads and sub-urban roads effect the fuel efficiency and vehicle performance. In order to achieve optimal fuel efficiency and vehicle performance, the appropriate combination of engine and transmission calibration curves/maps is selected and engine and transmission are calibrated to define drive modes based on load and terrain to achieve optimal fuel efficiency and vehicle performance. The system selects and calibrates engine and transmission based on multiple calibration curves/maps for each loading condition and vehicle operating terrain as mentioned above. Depending upon the loading condition and operating terrain perceived, the driver selects the appropriate combinations of engine and transmission calibration curves/maps manually. 10

Alternatively, based on the load and terrain conditions detected by the system, the engine and transmission calibration curves/maps are selected and the engine and transmission are calibrated based on the selection automatically.
In accordance with an embodiment, a maximum 16 different engine and transmission calibration curves/maps can be optimized for highest fuel efficiency and vehicle performance based on the various combinations of vehicle loading and terrain combinations. In accordance with another embodiment, in standalone 4 calibrations curves/maps can be optimized either for loading or terrain conditions, which can be decided based on vehicle application to application. For example –
a) In heavy commercial vehicle cargo application 8 different calibration curves/maps can be optimized for 4 loading conditions (Un-laden, Part load, Rated load, Overload) X 2 terrain types (Highway, Hilly).
b) For deep mining application 2 different calibration curves/maps can be optimized for 2 loading conditions (Un-laden, Overload) X 1 terrain type (Hilly or Mine).
c) For surface mining application 4 different calibration curves/maps can be optimized for 2 loading conditions (Un-laden, Overload) X 2 terrain types (Hilly, Highway).
d) For intercity bus/taxi application 9 different calibration curves/maps can be optimized for 3 loading conditions (Un-laden, Part load, Rated load) X 3 terrain types (Highways, Hilly, City).
e) For intra-city bus/taxi application 6 different calibration curves/maps can be optimized for 3 loading conditions (Un-laden, Part load, Rated load) X 2 terrain types (City, Sub-urban roads).
f) For pickup truck application 16 different calibration curves/maps can be optimized for 4 loading conditions (Un-laden, Part load, Rated load, Overload) X 4 terrain types (City, Sub-urban roads, Highways, Hilly).
g) For city car application 4 different calibration curves/maps can be optimized for 2 loading conditions (Un-laden, Part load) X 2 terrain types (City, Sub-urban roads).
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However, the system is not limited to the above mentioned calibration curves/maps only, the vehicle can also have number of calibration curves/maps based on various possible permutations and combinations of loading and terrain conditions, and required one can be selected either manually or automatically. The system includes a selection switch (50) to switch the system (100) between an automatic mode and a manual mode.
FIG. 1 illustrates a block diagram depicting selection of engine and transmission calibration curves based on different vehicle loading and terrain conditions in accordance with an embodiment of the present disclosure. FIG. 2 illustrates a block diagram depicting interaction between various elements of a manual system (100) for calibrating engine and transmission of a vehicle for configuring different drive modes based on vehicle loading and terrain conditions.
Referring to FIG. 2, the manual system (100) for calibrating engine and transmission of a vehicle for configuring different vehicle drive modes includes at least one memory storage unit, at least one controller (10) and a display unit (20). In accordance with an embodiment, the controller (10) is a Body control module. The memory storage unit stores a plurality of calibration curves/maps for the engine and transmission. Based on “on the go” selection of a particular combination of engine and transmission calibration curves/map, the Body Control module (10) facilitates calibration of the engine “E” and the transmission “T” to define a current drive mode, wherein selection of the combination of the engine and transmission calibration curves/map is based on perceived current vehicle loading condition and vehicle operating terrain to achieve optimum fuel efficiency and vehicle performance of the engine. The display unit (20) displays and indicates the current drive mode to vehicle occupant. The body control module (10), the engine, the display unit (20) are communicably coupled to each other through a network. The manual system (100) includes a user interface (30) to facilitate manual selection of a particular combination of engine and transmission calibration curves/map by a driver of the vehicle based on perceived vehicle loading condition and terrain to define the manual mode. In accordance with one 12

embodiment, the user interface (30) is a toggle switch. In accordance with another embodiment, the user interface (30) is a digital interface display. In manual mode, the vehicle occupant manually selects particular combination of engine and transmission calibration curves/map using the user interface (30) based on vehicle loading condition and terrain. In accordance with an embodiment, the Body Control module (10) directly calibrates the engine and the transmission to define the current drive mode. Alternatively, the Body Control module (10) facilitates calibration of the engine “E” and the transmission “T” through an engine and transmission management module (40) to define the current drive mode.
Specifically, depending upon the loading condition and terrain type, the driver selects the required mode through provided human machine interface i.e. toggle switch or digital interface display. Driver selected mode can be fed either directly to engine/transmission management system (40) or through body control module/standalone controller (10) depending upon the configuration of vehicle electrical architecture system. Based on the driver input the desired calibration curve/map is selected and deployed to engines to follow and simultaneously selected mode is displayed on the display unit (20) or instrument cluster by means of visual indications.
In accordance with an embodiment of the present disclosure, a manual method for calibrating an engine and a transmission of the vehicle for configuring drive modes of the vehicle is disclosed. The method includes the steps of manually selecting a particular combination of engine and transmission calibration curves/map based on perceived current vehicle loading condition and vehicle operating terrain, thereafter calibrating of the engine “E” and the transmission “T” based on the selection to define a current drive mode and finally displaying and indicating the current drive mode to vehicle occupant.
Referring to FIG. 3, an automatic system (200) for calibrating engine and transmission of a vehicle for configuring different vehicle drive modes includes at least one memory storage unit, at least one of vehicle load sensing module and 13

terrain condition sensing module, at least one controller (110) and a display unit (120). In accordance with an embodiment, the controller is a Body control module. The storage unit stores a plurality of calibration curves/maps for the engine and transmission. Based on “on the go” selection of a particular combination of engine and transmission calibration curves/map, the Body Control module (110) facilitates calibration of the engine “E” and the transmission to define a current drive mode, wherein selection of the combination of the engine and transmission calibration curves/map is based on current vehicle loading condition and vehicle operating terrain detected by the vehicle load sensing module and terrain condition sensing module to achieve optimum fuel efficiency and vehicle performance of the vehicle. The display unit (120) displays and indicates the current drive mode to vehicle occupant. The terrain condition sensing module is a navigation module.
In accordance with an embodiment, the display unit (120) is the infotainment system of the vehicle. Alternatively, the display unit (120) is the instrument panel of the vehicle. Specifically, the load sensing module and the navigation module / system “N” detects the current vehicle loading condition and the vehicle operating terrain respectively, wherein based on the current vehicle loading condition and terrain detected by the load sensing module and the navigation module “N” respectively, the Body Control module (110) facilitates automatic selection of particular combination of engine and transmission calibration curves/map and calibration of the engine and the transmission accordingly to define the automatic mode. In the automatic mode, the system automatically selects combination of engine and transmission calibration curves/map based on vehicle loading condition and terrain detected by the load sensing module and the navigation module respectively and calibrates the engine and transmission accordingly to achieve optimal fuel economy and vehicle performance. Specifically, with the automatic system, all the manual steps are automated using means to detect the change in loading conditions and terrain types. In accordance with an embodiment, the load sensing module utilize either of already available Automatic Load Sensing Valve (ALSV) and Load Sensing Pressure Valve (LSPV) integrated 14

in a brake circuit of the vehicle along with a pressure sensor “P” to determine vehicle loading condition, wherein either of the Automatic Load Sensing Valve (ALSV) and the Load Sensing Pressure Valve (LSPV) regulates pressure in a rear brake circuit based on the axle load, further, based on the change in pressure in the rear brake circuit the vehicle loading condition is determined.
However, the present disclosure is not limited to any particular configuration of the load sensing module and navigation module.
Specifically, as most of the vehicles are equipped with either automatic load sensing valve (ALSV) or load sensing pressure valve (LSPV) integrated in the brake circuit. Wherein such valves sense the load on the rear axle and regulates the pressure in the rear brake circuit that is directly proportional to the axle load. By sensing/measuring the change in mean brake circuit pressure by the pressure sensor “P”, the change in loading conditions (un-laden, part load, rated load and overload) is detected. The output of pressure sensor “P” is fed either directly to engine/transmission management system (140) or through body control module/standalone controller (110) depending upon the configuration of vehicle electrical architecture system. Thereafter the engine management system, calibrates the engine and the transmission. The automatic load sensing valve (ALSV) or load sensing pressure valve (LSPV) and Pressure transducer “P” provide real time signal (analogue, digital or CAN) proportional to vehicle loading condition and Navigation system provide real time signal (analogue, digital or CAN) indicating the terrain type to the body control module or standalone controller (110). Based on the inputs received the body control module or standalone controller decides the kind of calibration curve/map to be deployed in the engine and transmission management system (EMS) to follow. All calibration curves/maps are stored in the Engine Management System (EMS) and will be called upon the controller based on the input received from Body Control module (110) or standalone controller. 15

FIG. 4 illustrates a characteristic curve of a typical automatic load sensing valve (ALSV) or load sensing pressure valve (LSPV) used for detecting vehicle loading in case of the automatic system. The load sensing module, the navigation system/module “N”, the body control module (110), the engine, the display unit (120) are communicably coupled to each other through a network. In accordance with an embodiment, the network is a Controller Area Network (CAN). In accordance with another embodiment, the network is a wireless network. In accordance with still another embodiment, the network is a wired network. In accordance with one embodiment, the Body Control module (110) directly calibrates the engine and the transmission to define the current drive mode. In accordance with another embodiment, the Body Control module (110) facilitates calibration of the engine and the transmission through an engine and transmission management module (140) to define the current drive mode.
With such configuration, the Engine and transmission (AT&AMT) calibration can be tuned for all possible vehicle applications based on the customer requirements ensuring optimum fuel efficiency and vehicle performance in all real world driving conditions. Further, with such configuration, highest fuel economy and optimum vehicle performance is achieved in all applications i.e. mining, cargo, city on the same vehicle and vehicle abuse is limited, resulting in to better powertrain aggregate life.
The terrain conditions are categorized broadly as Highway, City, Hilly and Sub-urban roads/terrains. The Global Positioning System (GPS) and navigation system of the vehicle detects and classifies geographical details and terrain condition in which vehicle is traversing as highway, city, hilly and sub-urban roads. The navigation system is programmed to provide suitable output i.e. analogue/digital/CAN, which can be fed either directly to engine/transmission management system (140) or through body control module/standalone controller (110) depending upon the configuration of vehicle electrical architecture system. 16

In accordance with an embodiment of the present disclosure, a method for calibrating an engine and a transmission of the vehicle for defining drive modes of the vehicle is disclosed. The method includes the steps of detecting current vehicle loading condition and vehicle operating terrain by a load sensing module and a navigation module respectively, selecting a particular combination of engine and transmission calibration curves/map based on detected current vehicle loading condition and vehicle operating terrain, thereafter calibrating of the engine “E” and the transmission “T” based on the selection to define a current drive mode, and finally displaying and indicating the current drive mode to vehicle occupant.
FIG. 5 illustrates a block diagram depicting operation of the system in either one of automatic and manual mode or combination of automatic and manual mode, wherein combination of manual and automatic calibration selection mode can be achieved with features of the both the processes integrated together.
While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
Advantages:
The present disclosure provides a system for calibrating engine and transmission of a vehicle for configuring different vehicle drive modes and selection of appropriate drive mode either manually or automatically that:
• improves fuel economy and vehicle performance compared to the conventional multi-mode drive systems;
• achieves a particular combination of engine and transmission calibration curves/maps for improving fuel economy and vehicle performance;
• can operate in manual as well as automatic mode, thereby eliminating the need for constant driver attention;
• positively indicates current drive mode to the occupant of the vehicle;
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• can be used for all possible vehicle applications based on the customer requirements, thereby ensuring optimum fuel efficiency and vehicle performance in all real world driving conditions;
• improves aggregate service life of the powertrain;
• restrains vehicle abuse and reduces maintenance frequency and maintenance cost;
• is reliable, systematic and convenient to use and configure; and
• ensures swift and controlled drive mode change, thereby enhancing driving control, occupant comfort and safety.

Referral Numerals: Reference Number Description
(100) A system for calibrating an engine and a transmission of a vehicle for defining drive modes of the vehicle;
(10) a controller;
(20) a display unit;
(30) a user interface;
(40) an engine and transmission management module;
(50) selection switch
“N” Navigation module
“P” Pressure sensor
“E” Engine
“T” Transmission

We Claim:
1. A system (100) for calibrating an engine and a transmission of a vehicle for configuring different vehicle drive modes, said system (100) comprising:
• at least one memory storage unit adapted to store a plurality of calibration curves/maps for an engine and a transmission; and
• at least one controller (10) adapted to facilitate calibration of the engine “E” and the transmission “T” to define a current drive mode, wherein selection of the combination of engine and transmission calibration curves/map is based on current vehicle loading condition and terrain to achieve optimum fuel efficiency and performance of the vehicle.

2. The system (100) as claimed in claim 1, wherein the controller is a Body Control Module (BCM).

3. The system (100) as claimed in claim 1, further comprising a selection switch (50) to switch said system (100) between an automatic mode and a manual mode.

4. The system (100) as claimed in claim 3, further comprising a user interface (30) adapted to facilitate manual selection of a particular combination of engine and transmission calibration curves/map by a driver of the vehicle based on vehicle loading condition and terrain to define the manual mode.

5. The system as claimed in claim 3, further comprising a load sensing module and a navigation module adapted to detect the current vehicle loading condition and the vehicle operating terrain respectively, wherein based on the current vehicle loading condition and terrain detected, said controller (110) adapted to facilitate automatic selection of particular combination of engine and transmission calibration curves/map and
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calibration of the engine and the transmission accordingly, to define the automatic mode.

6. The system as claimed in claim 5, wherein said load sensing module adapted to utilize either of already available Automatic Load Sensing Valve (ALSV) and Load Sensing Pressure Valve (LSPV) integrated in a brake circuit of the vehicle along with a pressure sensor to determine vehicle loading condition, wherein either of said Automatic Load Sensing Valve (ALSV) and said Load Sensing Pressure Valve (LSPV) regulates pressure in a rear brake circuit based on the axle load, further based on change in pressure in the rear brake circuit detected by the pressure sensor “P”, the vehicle loading condition is determined.

7. The system as claimed in claim 5, wherein said load sensing module, said terrain condition sensing module, said controller, said engine, said transmission, said display unit are communicably coupled to each other through a network.

8. The system as claimed in claim 7, wherein the network is a Controller Area Network (CAN).

9. The system as claimed in claim 7, wherein the network is a wireless network.

10. The system as claimed in claim 7, wherein the network is a wired network.

11. The system as claimed in claim 2, wherein said Body Control module is adapted to directly calibrate the engine and the transmission to define the current drive mode.

12. The system as claimed in claim 2, wherein said Body Control module adapted to facilitate calibration of the engine and the transmission through an engine and transmission management module to define the current drive mode.
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13. The system as claimed in claim 1, wherein the display unit (20) is the infotainment system of the vehicle.

14. The system as claimed in claim 1, wherein the display unit (20) is the instrument panel of the vehicle.

15. The system (100) as claimed in claim 1, further comprising a display unit (20) adapted to display and indicate the current drive mode to vehicle occupant.

16. A method for calibrating an engine and a transmission of a vehicle for configuring different drive modes of the vehicle, said method comprising the following steps:
o storing a plurality of calibration curves/maps for the engine and transmission by a memory storage unit;
o selecting by a user a particular combination of engine and transmission calibration curves/map based on perceived current vehicle loading condition and vehicle operating terrain;
o calibrating of the said engine “E” and said transmission “T” based on said selection to define a current drive mode by a controller; and
o displaying and indicating said current drive mode to vehicle occupant by a display unit.

17. An automatic method for defining drive modes of a vehicle by calibrating an engine and a transmission of the vehicle, said method comprising the following steps:
o storing a plurality of calibration curves/maps for the engine and transmission by a memory storage unit;
o detecting current vehicle loading condition and vehicle operating terrain by
a load sensing module and a navigation module respectively;
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o selecting a particular combination of engine and transmission calibration curves/map based on detected current vehicle loading condition and vehicle operating terrain by a controller;
o calibrating of the engine “E” and the transmission “T” based on the selection to define a current drive mode by said controller; and
o displaying and indicating the current drive mode to vehicle occupant by a display unit.