Claims:We claim:
1. A method of controlling a vehicle operating state, the method comprising of receiving by a vehicle control unit (002), a real time operating state parameter values of one or more electrical component (001, 003, 004) using
one or more sensors (not shown);
comparing by the vehicle control unit (002), the real time operating state parameter values of the vehicle with a predetermined operating state parameter values of the vehicle, by a processing unit (not shown); and
determining by the vehicle control unit (002), at least one operating state of a plurality of operating states for the one or more electrical component (001, 003, 004) if the real time operating state parameter value is more than at least one pre-determined operating state parameter values of the vehicle.

2. The method of controlling the vehicle operating state as claimed in claim 1, wherein the vehicle control unit (002) determines the at least one operating state of the plurality of operating states using the steps of:
determining a first event, whether the real time operating state parameter value of the vehicle being more than the first predetermined operating state parameter value of the vehicle, at step (103), wherein based upon affirmative determination at step (103), the vehicle control unit (002) limits the output current from one or more electrochemical cells (001) by a predetermined value;
determining a second event, whether the real time operating state parameter values of the vehicle being more than the second predetermined operating state parameter values of the vehicle, at step (104), wherein based upon affirmative determination at step (104), the vehicle control unit (002) determines a real time ride mode, at step (105);
determining a third event, whether the real time ride mode being a power mode, based on affirmative determination at third event, the vehicle control unit (002) changes the real time ride mode to first failsafe ride mode or economy mode; and

determining a fourth event, whether the real time operating state parameter values of the vehicle being more than the third predetermined operating state parameter values of the vehicle, at step (106), wherein based upon affirmative determination at step (106), the vehicle control unit (002) cuts-off a power output from one or more motor controller (003).

3. The method of controlling the vehicle operating state as claimed in claim 2, wherein the predetermined value being in range of 15 % to 25% of a continuous real time value.

4. The method of controlling the vehicle operating state as claimed in claim 2, wherein the predetermined mode includes a power mode.

5. The method of controlling the vehicle operating state, as claimed in claim 1, wherein the vehicle control unit (002) determines the at least one operating state of the plurality of operating states using the steps of:
determining a first event, whether the real time operating state parameter value of the vehicle being more than the first predetermined operating state parameter value of the vehicle, at step (203), wherein based upon affirmative determination at step (103), the vehicle control unit (002) limits the output power of one or more motor controller (003), by a predetermined value;
determining a second event, whether the real time operating state parameter values of the vehicle being more than the second predetermined operating state parameter values of the vehicle, wherein based upon affirmative determination at step (204), the vehicle control unit (002) determines a real time ride mode at step (205);
determining a third event, whether the real time ride mode being a power mode, based on affirmative determination at third event, the vehicle control unit (002) changes the real time ride mode to first failsafe ride mode or economy mode; and

determining a fourth event, whether the real time operating state parameter values of the vehicle being more than the third predetermined operating state parameter values of the vehicle, at step (206), wherein based upon affirmative determination at step (206), the vehicle control unit (002) cuts-off a power output from the one or more motor controller (003).

6. The method of controlling the vehicle operating state, as claimed in claim 1, wherein the vehicle control unit (002) determines the at least one operating state of the plurality of operating states using the steps of:
determining a first event, whether the real time operating state parameter value of the vehicle being more than the first predetermined operating state parameter value of the vehicle, at step (303), wherein based upon affirmative determination at step (303) limit the output power of one or more electric machine (004), by a predetermined value; and
determining a second event, whether the real time operating state parameter values of the vehicle being more than the third predetermined operating state parameter values of the vehicle, at step (304), wherein based upon affirmative determination at step (304) the vehicle control unit (002) cuts-off a power output from the motor controller (003).

7. The method of controlling the vehicle operating state as claimed in claim 5 or claim 6, wherein the predetermined value ranges from 25% to 30% of the output power.

8. A method of controlling a vehicle operating state, the method comprising: receiving a ride mode change input from a user, at step (401);
receiving a real time operating state parameter values of the vehicle from one or more sensors (not shown), at step (402);
comparing the real time vehicle state parameter value with a predetermined vehicle state parameter value, at step (403), by the processing unit (not shown);

determining a first event whether the real time vehicle state parameter value being less than the first predetermined vehicle state parameter value, at step (404), wherein based on affirmative determination, at step (405), changing the ride mode to user requested mode, and wherein based on negative determination, retain real time ride mode; and
determining as a third event whether the real time vehicle state parameter value being greater than the third predetermined vehicle state parameter value, at step (406), wherein based upon affirmative determination, the vehicle control unit cuts-off output power from a motor controller (003).

9. The method of controlling the vehicle operating state as claimed in claim 1, wherein the real time operating state parameter values includes an electric machine (004) temperature value, a control unit (003) temperature value and an electrochemical cell (001) temperature value.

10. The method of controlling the vehicle operating state as claimed in claim 2, wherein the first predetermined operating state parameter values includes the electro chemical cell (001) temperature value ranging from 45 degrees to 50 degrees.

11. The method of controlling the vehicle operating state as claimed in claim 5, wherein the first predetermined operating state parameter values includes the motor controller (003) temperature value ranging from 85 degrees to 95 degrees.

12. The method of controlling the vehicle operating state as claimed in claim 6, wherein the first predetermined operating state parameter values includes the electric machine temperature (004) value ranging from 90 degrees to 100 degrees.

13. The method of controlling the vehicle operating state as claimed in claim 2, wherein the second predetermined operating state parameter values includes the electro chemical cell (001) temperature value ranging from 50 degrees to 55 degrees.

14. The method of controlling the vehicle operating state as claimed in claim 5, wherein the second predetermined operating state parament values includes the motor controller unit (003) temperature value ranging from 105 degrees to 115 degrees.

15. The method of controlling the vehicle operating state as claimed in claim 6, wherein the second predetermined operating state parameter values includes the electric machine (004) temperature value ranging from 115 degrees to 125 degrees.

16. The method of controlling the vehicle operating state as claimed in claim 2, wherein the third predetermined operating state parameter values includes the electro chemical cell (001) temperature value ranging from 55 degrees to 60 degrees.

17. The method of controlling the vehicle operating state as claimed in claim 5, wherein the third predetermined operating state parameter values includes the motor controller (003) temperature value ranging from 115 degrees to 120 degrees.

18. The method of controlling the vehicle operating state as claimed in claim 6, wherein the third predetermined operating state parameter values includes the electric machine (004) temperature value ranging from 140 degrees to 150 degrees.

19. A vehicle comprising:
one or more electrochemical cells (001); one or more electric machine (004);
one or more motor controller (003);
a mode selection interface to receive an input ride mode selection from a user;
one or more vehicle control unit (002), the vehicle control unit (002) being configured to receive inputs from one or more sensors (not shown), the one or more sensors configured to provide a real time operating state parameter values to the one or more vehicle control unit (002), the vehicle control unit
(2) being configured to detect a real time vehicle state parameter values and compare with a predetermined vehicle state parameter values to generate a predetermined output command; and
one or more motor controller (003), the one or more motor controller
(3) being configured to limit the power of an electric machine (004) based on the predetermined output command from the vehicle control unit (002).
, Description:TECHNICAL FIELD
[0001] The present subject matter relates generally to a vehicle. More particularly but not exclusively the present subject matter relates to a method of controlling a vehicle operating state.

BACKGROUND
[0002] Generally, in an electric vehicle or a hybrid electric vehicle, a traction motor is a major drive force, which runs the vehicle. The traction motor receives the power from one or more power source to drive the vehicle. A motor controller controls the amount of power to be supplied to the traction motor to rotate one or more wheels of the vehicle. All the electrical components, like the traction motor, the motor controller, the power source, and the like used in the vehicle has an operating range in which they can safely operate. The determination of operating range is also governed by other factors such as temperature, pressure, humidity, and the like. The electrical components should be reliable so that it can be operated in all types of load conditions as well as environmental conditions.

BRIEF DESCRIPTION OF THE DRAWINGS

[0003] The details are described with reference to an embodiment of a vehicle along with the accompanying figures. The same numbers are used throughout the drawings to reference similar features and components.
[0004] Figure 1 exemplarily illustrates a block diagram for a method controlling a vehicle operating state with the involved one or more components.
[0005] Figure 2 exemplarily illustrates a flowchart for the method of controlling a vehicle operating state, according to an embodiment of the present invention. [0006] Figure 3 exemplarily illustrates a flowchart for the method of controlling a vehicle operating state, according to another embodiment of the present invention.

[0007] Figure 4 exemplarily illustrates a flowchart for the method of controlling a vehicle operating state, according to yet another embodiment of the present invention.
[0008] Figure 5 exemplarily illustrates a flowchart for the method of controlling a vehicle operating state, according to yet another embodiment of the present invention.

DETAILED DESCRIPTION

[0001] Conventionally, in an electric vehicle and a hybrid electric vehicle, a traction motor and a motor controller are used to drive the vehicle. The various electrical components used in above-mentioned vehicles are susceptible to overheating under high load conditions. Similarly, the motor which is made up of metal like copper, aluminium, and the like, and the controller which is made up of various metals, plastics parts, and other electronics, gets heated while performing their functions. The temperature rise of the electrical components during the operation, limits the intended function of the electrical components, which is not desirable. The rise in temperature beyond the operating limit not only limits the intended function of the electrical components, but it may lead to the failure of the electrical component. This results in damaging the electrical component as well as the part to which it is connected to.
[0002] In order to avoid the rise in temperature, mechanism of natural cooling, forced cooling, or mixed cooling is employed in many vehicles. The cooling system present in many vehicles provide sufficient cooling to the electrical part. But these cooling mechanisms do not provide any means which can regulate a safe functioning of the electrical components, in case of temperature rise. In the absence of such a mechanism, there is no means to control the electrical component to be operated in a safe operating range specified for the related components. If the electrical component is operated in the range of temperature in which it can fail or get damaged, the life expectancy of the component is also hampered. This means that the electrical component will not complete its operation for the life span for

which it was manufactured. The entire electrical part is to be replaced by a new one, which adds to the cost for the user of the vehicle.
[0003] Therefore, there is a need of a mechanism which indicates the user of the vehicle about the operating condition and acts as a guard for the electrical components like the motor, the motor controller, vehicle control unit, or any other electrical components by either derating the component or shutting off the component from operating, in case of dangerously high temperature conditions. A method of controlling the vehicle operating state should be such that it caters to the various requirements of platform of product variants while overcoming all above problems as well as other problems of known art.
[0004] An objective of the present subject matter is to provide a derating scheme to improve the reliability of the electrical components and thereby preventing the failure of the electrical components, safeguarding the life span of the electrical components, and ensuring the safe operation of the vehicle. The present subject matter is applicable to any type of electric and hybrid electric vehicle, with required changes and without deviating from the scope of invention.
[0005] As per an aspect of the present subject matter, a method is disclosed for controlling a vehicle operating state, the method comprises of receiving by a vehicle control unit, a real time operating state parameter values of one or more electrical component using one or more sensors; comparing by the vehicle control unit, the real time operating state parameter values of the vehicle with a predetermined operating state parameter values of the vehicle, by a processing unit; and determining by the vehicle control unit, at least one operating state of a plurality of operating states for the one or more electrical component if the real time operating state parameter value is more than at least one pre-determined operating state parameter values of the vehicle.
[0006] As per an aspect of the present subject matter, the vehicle control unit determines the at least one operating state of the plurality of operating states using the steps of: determining a first event, whether the real time operating state parameter value of the vehicle is more than the first predetermined operating state parameter value of the vehicle, wherein based upon affirmative determination, the

vehicle control unit limits the output current from one or more electrochemical cells of a battery unit by a predetermined value; determining a second event, whether the real time operating state parameter values of the vehicle is more than the second predetermined operating state parameter values of the vehicle, wherein based upon affirmative determination, the vehicle control unit determines a real time ride mode; determining a third event, whether the real time ride mode is a power mode, based on affirmative determination at third event, the vehicle control unit changes the real time ride mode to first failsafe ride mode or economy mode; and determining a fourth event, whether the real time operating state parameter values of the vehicle is more than the third predetermined operating state parameter values of the vehicle, wherein based upon affirmative determination, the vehicle control unit cuts-off a power output from one or more motor controller.
[0007] As per an aspect of the present subject matter, the predetermined value includes 15-25% of a continuous real time value. The predetermined mode includes a power mode.
[0008] As per an aspect of the present subject matter, the method of controlling the vehicle operating state, wherein the vehicle control unit determines the at least one operating state of the plurality of operating states using the steps of determining a first event, whether the real time operating state parameter value of the vehicle is more than the first predetermined operating state parameter value of the vehicle, wherein based upon affirmative determination, the vehicle control unit limits the output power of one or more motor controller, by a predetermined value; determining a second event, whether the real time operating state parameter values of the vehicle is more than the second predetermined operating state parameter values of the vehicle, wherein based upon affirmative determination, the vehicle control unit determines a ride mode; determining a third event, whether the real time ride mode is a power mode, based on affirmative determination at third event, the vehicle control unit changes the real time ride mode to first failsafe ride mode or economy mode; and determining a fourth event, whether the real time operating state parameter values of the vehicle is more than the third predetermined operating state parameter values of the vehicle, wherein based upon affirmative

determination, the vehicle control unit cuts-off a power output from one or more motor controller.
[0009] As per an aspect of the present subject matter, the method of controlling the vehicle operating state, wherein the vehicle control unit determines the at least one operating state of the plurality of operating states using the steps of determining a first event, whether the real time operating state parameter value of the vehicle is more than the first predetermined operating state parameter value of the vehicle, wherein based upon affirmative determination, limiting the output power of one or more electric machine, by a predetermined value; and determining a second event, whether the real time operating state parameter values of the vehicle is more than the third predetermined operating state parameter values of the vehicle, wherein based upon affirmative determination, cutting-off a power output from the motor controller.
[00010] As per an aspect of the present subject matter, the predetermined value ranges from 25-30% of the output power.
[00011] As per an aspect of the present subject matter, a method of controlling a vehicle operating state, the method comprising receiving a ride mode change inputs from a user; receiving a real time operating state parameter values of the vehicle from one or more sensors; comparing the real time vehicle state parameter value with a predetermined vehicle state parameter value, by the processing unit; determining a first event whether the real time vehicle state parameter value is less than the first predetermined vehicle state parameter value, wherein based on affirmative determination, determining a second event regarding change of the ride mode to user requested mode, and wherein based on negative determination, retaining real time ride mode; determining as a third event whether the real time vehicle state parameter value is greater than the third predetermined vehicle state parameter value, wherein based upon affirmative determination, the vehicle control unit cuts-off output power from a motor controller.
[00012] As per an aspect of the present subject matter, the real time operating state parameter values includes an electric machine temperature value, a control unit temperature value and an electrochemical cell temperature value. The first

predetermined operating state parameter values includes the electric machine temperature value which as per an embodiment ranges from 90 degrees to 100 degrees. The first predetermined operating state parameter values includes the motor controller temperature value ranging from 85 degrees to 95 degrees. The first predetermined operating state parameter values includes the electro chemical cell temperature value ranging from 45 degrees to 50 degrees.
[00013] As per an aspect of the present subject matter, the second predetermined operating state parameter values includes the electric machine temperature value ranging from 115 degrees to 125 degrees. The second predetermined operating state parament values includes the motor controller temperature value ranging from 105 degrees to 115 degrees. The second predetermined operating state parameter values includes the electro chemical cell temperature value ranging from 50 degrees to 55 degrees.
[00014] As per an aspect of the present subject matter, the third predetermined operating state parameter values includes the electric machine temperature value ranging from 140 degrees to 150 degrees. The third predetermined operating state parameter values includes the motor controller temperature value ranging from 115 degrees to 120 degrees. The third predetermined operating state parameter values includes the electro chemical cell temperature value ranging from 55 degrees to 60 degrees.
[00015] As per an aspect of the present subject matter, a vehicle comprising: one or more electrochemical cells; one or more electric machine; one or more motor controller; a mode selection interface to receive an input ride mode selection from a user; one or more vehicle control unit, the vehicle control unit is configured to receive inputs from one or more sensors, the one or more sensors are configured to provide a real time operating state parameter values to the one or more vehicle control unit, the vehicle control unit is configured to detect a real time vehicle state parameter values and compare with a predetermined vehicle state parameter values to generate a predetermined output command; and one or more motor controller, the one or more motor controller is configured to limit the power of an electric machine based on the predetermined output command from the vehicle control unit.

The embodiments of the present invention will now be described in detail with reference to an embodiment in vehicle along with the accompanying drawings. However, the present invention is not limited to the present embodiments. The present subject matter is further described with reference to accompanying figures. It should be noted that the description and figures merely illustrate principles of the present subject matter. Various arrangements may be devised that, although not explicitly described or shown herein, encompass the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects, and examples of the present subject matter, as well as specific examples thereof, are intended to encompass equivalents thereof.
[00016] Fig.1 exemplarily illustrates a block diagram for a method controlling a vehicle operating state with the involved one or more components. The system includes one or more electrochemical cells 001, one or more vehicle control unit 002, one or more control unit 003, one or more electric machine 004, one or more sensors (not shown), and a throttle unit 005. In the present embodiment, the one or more electrical machine 004 is a traction motor. In the present embodiment, the one or more control unit 003 is traction motor controller, also referred as controller. The one or more electrochemical cells 001 is a battery. The battery 001 is communicatively coupled with the one or more traction motor controller 003 and supplies DC input from the battery 001 to drive the one or more traction motor 004 for different speed and torque. The battery 001 includes one or more sensors (not shown) to sense the temperature of the battery 001 during the operation as well as in standstill position of the vehicle. The traction motor controller 003 is connected to the traction motor 004 through a three-phase wire which provides the necessary AC power to run the traction motor 004 accordingly. The traction motor controller 003 has one or more temperature sensor (not shown) and a temperature sensing circuit (not shown) disposed inside the controller 003. The traction motor 004 provides one or more sensor input to the traction motor controller 003. The throttle unit 005 gives the input to the traction motor controller 003 for riding the vehicle. A power supply of nominal voltage is given to the throttle unit 005 for its operation. The output of throttle unit 005 is a varying DC voltage. The varying DC voltage is

read by the traction motor controller 003 and is converted to digital values for internal calculations. The rotation of the throttle unit 005 gives unique values at every position of its rotation. Due to this, the traction motor 004 is able to identify the values and power on which it is to be operated. The input power to the traction motor controller 003 is provided by the battery 001. The traction motor 004 drives one or more wheel and thus drives the vehicle. The one or more vehicle control unit
002 receives the traction motor 004 and the traction motor controller 003 temperature data over a bidirectional communication line from the traction motor controller 003. In the present embodiment, the communication line is a CAN bus
006. The vehicle control unit 002 is also communicatively coupled to the battery
001 through the CAN bus 006 to obtain the battery 001 temperature.
[00017] The vehicle control unit 002 further communicates the temperature data of the traction motor 004, the traction motor controller 003, and the battery 001 to an instrument cluster (not shown) to give warning indication to the user of the vehicle. The vehicle control unit 002 monitors the temperature data of the motor 004, the motor controller 003, and the battery 001. Based on the temperature, the vehicle control unit 002 gives signals to the motor controller 003 to either derate the output power supplied to the motor 004 or to shut off the motor 004 resulting in shut down of the vehicle. During the derating of the output power of the motor controller 003, the vehicle is drivable but with lesser power. This affects the acceleration and top speed of the vehicle but derating the output power enables the user to travel more distance with lesser power, thus improving the range of the vehicle without getting into a breakdown of any vehicle system which can render the user stranded. The process of derating the output power limits the temperature rise and thus keeps the battery 001, the motor controller 003, and the motor 004 in safe operating ranges and thus avoiding failure due to overheating of the electrical components.
[00018] In an embodiment, the charging of the battery 001 is controlled by a BMS (battery management system) (not shown) and the vehicle control unit 002. On receiving AC input, a charger (not shown) initiates the CAN request and provide DC output for a duration of say, 5 second. Once the CAN request is acknowledged by the CAN response by the vehicle control unit 002, the charger continues to

provide DC output or else the DC output is disabled by the charger. The standard real time consumed by the battery charger even after getting charged up to 100% is eliminated.
[00019] Fig.2 exemplarily illustrates a flowchart for the method of controlling a vehicle operating state, according to an embodiment of the present invention. The method controls the vehicle operating state based on the temperature of the one or more electrical components to protect the components from getting damaged. In the present embodiment, the vehicle control unit 002 receives a real time operating state parameter values of the vehicle from one or more sensors (not shown), when the vehicle is in ON condition, at step (101). A processing unit (not shown) of the vehicle control unit 002, then compares the real time operating state parameter values of the vehicle with a predetermined operating state parameter values of the vehicle, at step (102). The vehicle control unit 002 further determines a first event, whether the real time operating state parameter value of the vehicle is more than the first predetermined operating state parameter value of the vehicle, at step (103). In the present embodiment, the operating state parameter values of the motor controller 003, the battery 001, and the motor 004 is taken into consideration for comparison. Based upon an affirmative determination at step (103), the vehicle control unit 002 limits the output power from one or more electrochemical cells 001 by a predetermined value. If there is a negative affirmation, then the motor controller 003 continues to drive the traction motor 004 as per desired input from the user of the vehicle. Then the vehicle control unit 002 determines a second event, by comparing whether the real time operating state parameter values of the vehicle is more than the second predetermined operating state parameter values of the vehicle, at step (104). Based upon affirmative determination at step (104), the vehicle control unit 002 determines a real time drive mode, at step (105). If there is a negative affirmation, then the motor controller 003 continues to drive the traction motor 004 as per desired input from the user with its derated output. Further, the vehicle control unit 002 determines a third event, whether the real time drive mode is a predetermined mode i.e. the power mode, and based on the affirmative determination at third event, real time mode is changed to a first failsafe

ride mode or ECO mode (economy mode). Then the vehicle control unit 002 determines a fourth event, whether the real time operating state parameter values of the vehicle is more than the third predetermined operating state parameter values of the vehicle, at step (106). Based upon the affirmative determination at step (106), the vehicle control unit 002 generates a signal requesting the traction motor controller 003 to cut-off output power to the traction motor 004. But if there is a negative affirmation, then the vehicle continues to drive in economy mode. The predetermined value by which the electrochemical cell i.e. the battery 001 is limited, lies in the range of 15-25% of a continuous real time value. As per a preferred embodiment, the predetermined mode includes a power mode.
[00020] Fig.3 exemplarily illustrates a flowchart for the method of controlling a vehicle operating state, according to another embodiment of the present invention. The method controls the vehicle operating state based on the temperature of the one or more electrical components to protect the components from getting damaged. In the present embodiment, the vehicle control unit 002 receives a real time operating state parameter values of the vehicle from one or more sensors (not shown), when the vehicle is in ON condition, at step (201). The processing unit (not shown) of the vehicle control unit 002, then compares the real time operating state parameter values of the vehicle with a predetermined operating state parameter values of the vehicle, at step (202). In the present embodiment, the operating state parameter values of the motor controller 003, the battery 001, and the motor 004 is taken into consideration for comparison. The vehicle control unit 002 further determines a first event, whether the real time operating state parameter value of the vehicle is more than the first predetermined operating state parameter value of the vehicle, at step (203). Based upon an affirmative determination at step (203), the vehicle control unit 002 limits the output power from the traction motor controller 003 by a predetermined value. If there is a negative affirmation, then the motor controller 003 continues to drive the traction motor 004 as per desired input from the user of the vehicle. Further, the vehicle control unit 002 determines a second event, by comparing whether the real time operating state parameter values of the vehicle is more than the second predetermined operating state parameter values of the vehicle,

at step (204). Based upon affirmative determination at step (204), the vehicle control unit 002 determines a real time drive mode, at step (205). If there is a negative affirmation, then the motor controller 003 continues to drive the traction motor 004 as per desired input from the user with its derated output. Further, the vehicle control unit 002 determines a third event, whether the real time drive mode is a predetermined mode, and based on the affirmative determination at third event, real time mode is changed to a first failsafe ride mode or economy mode. Then the vehicle control unit 002 determines a fourth event, whether the real time operating state parameter values of the vehicle is more than the third predetermined operating state parameter values of the vehicle, at step (206). Based upon the affirmative determination at step (206), the vehicle control unit 002 generates a signal requesting the traction motor controller 003 to cut-off output power to the traction motor 004. But if there is a negative affirmation, then the vehicle continues to drive in economy mode. The predetermined value by which the motor controller 003 is limited, lies in the range of 25-30% of a continuous real time value. As per a preferred embodiment, the predetermined mode includes a power mode.
[00021] Fig.4 exemplarily illustrates a flowchart for the method of controlling a vehicle operating state, according to yet another embodiment of the present invention. The method controls the vehicle operating state based on the temperature of the one or more electrical components. In the present embodiment, the vehicle control unit 002 receives a real time operating state parameter values of the vehicle from one or more sensors (not shown), when the vehicle is in ON condition, at step (301). The processing unit (not shown) of the vehicle control unit 002, then compares the real time operating state parameter values of the vehicle with a predetermined operating state parameter values of the vehicle, at step (302). In the present embodiment, the operating state parameter values of the motor controller 003, the battery 001, and the motor 004 is taken into consideration for comparison. The vehicle control unit 002 further determines a first event, by comparing whether the real time operating state parameter value of the vehicle is more than the first predetermined operating state parameter value of the vehicle, at step (303). Based upon an affirmative determination at step (303), the vehicle control unit 002 limits

the motor output power by means of the traction motor controller 003 by a predetermined value. If there is a negative affirmation, then the motor controller 003 continues to drive the traction motor 004 as per desired input from the user of the vehicle. Then the vehicle control unit 002 determines a second event, whether the real time operating state parameter values of the vehicle is more than the second predetermined operating state parameter values of the vehicle, at step (304). Further, the vehicle control unit 002 determines a third event, whether the real time drive mode is a predetermined mode, and based on the affirmative determination at third event, real time mode is changed to a first failsafe ride mode or economy mode. Then the vehicle control unit 002 determines a fourth event, whether the real time operating state parameter values of the vehicle is more than the third predetermined operating state parameter values of the vehicle, at step (306). Based upon affirmative determination at step (306), the vehicle control unit 002 cuts-off the power output from the motor controller 003. If there is a negative affirmation, then the motor controller 003 continues to drive the traction motor 004 in economy mode.
[00022] Fig.5 exemplarily illustrates a flowchart for the method of controlling a vehicle operating state, according to yet another embodiment of the present invention. In the present embodiment, the vehicle control unit 002 receives a ride mode changes inputs from the user, at step (401). The vehicle control unit 002, then receives the real time operating state parameter values of the vehicle from one or more sensors (not shown), at step (402). The vehicle control unit 002 further compares the real time vehicle state parameter value with a predetermined vehicle state parameter value, at step (403), by the processing unit (not shown). In the present embodiment, the operating state parameter values of the motor controller 003, the battery 001, and the motor 004 is taken into consideration for comparison. Then the vehicle control unit 002 determines a first event, whether the real time vehicle state parameter value is less than the first predetermined vehicle state parameter value, at step (404). Based on the affirmative determination, at step (404), the vehicle control unit 002 determines a second event, at step (405) and checks whether the real time drive mode is a power mode. If there is a negative

determination, then the vehicle control unit 002 changes the mode to user requested mode. Based upon an affirmative determination at step (405), the vehicle control unit 002 changes the mode to the economy mode. Then the vehicle control unit 002 determines a third event at step (406), whether the real time operating state parameter values of the vehicle is more than the third predetermined operating state parameter values of the vehicle, at step (406). Based upon affirmative determination at step (406), the vehicle control unit 002 cuts-off the power output from the motor controller 003. If there is a negative affirmation, then the motor controller 003 continues to drive the vehicle in economy mode.
[00023] The real operating state parameter values includes traction motor 004 temperature value, traction motor controller 003 temperature value and battery 001 temperature value. The first predetermined operating state parameter values includes the traction motor 004 temperature value ranging from 90 degrees to 100 degrees. The first predetermined operating state parameter values includes the traction motor controller 003 temperature value ranging from 85 degrees to 95 degrees. The first predetermined operating state parameter values includes the battery 001 temperature value ranging from 45 degrees to 50 degrees. The second predetermined operating state parameter values includes the traction motor 004 temperature value ranging from 115 degrees to 125 degrees. The second predetermined operating state parament values includes the motor controller 003 temperature value ranging from 105 degrees to 115 degrees. The second predetermined operating state parameter values includes the battery 001 temperature value ranging from 50 degrees to 55 degrees. The third predetermined operating state parameter values includes the traction motor 004 temperature value ranging from 140 degrees to 150 degrees. The third predetermined operating state parameter values includes the motor controller 003 temperature value ranging from 115 to 120. The third predetermined operating state parameter values includes the battery 001 temperature value ranging from 55 degrees to 60 degrees. The method controls the vehicle operating state based on the temperature of the one or more electrical components to protect the components from getting damaged and allows it to be operated in safe manner. Also, with derating of power, the vehicle is able to

cover more distance, thus increasing the mileage of the vehicle without putting much strain on the electrical components.
[00024] In another embodiment, the function of the vehicle control unit 002 and the traction motor controller 003 are combined together to be performed by a single unit to derate the output power. This simplifies the logic of reading the switch inputs, ease in communication of signals over CAN 006 and better integration of parts in the vehicle. Many other improvements and modifications may be incorporated herein without deviating from the scope of the invention.

List of Reference numerals 001: Battery
002: Vehicle control unit
003: Traction motor controller 004: Traction motor
005: Throttle unit
006: CAN bus