DESC:TECHNICAL FIELD
[0001] The present subject matter relates to a system and method to control operation of an engine. More particularly but not exclusively, a system and method to control operation of an engine based on inputs from plurality of sensors to prevent safety risk by avoiding unintended start of the engine during a vehicle operation thereby making the vehicle more consumer friendly.
BACKGROUND
[0002] Generally, vehicles are provided with an internal combustion engine. There are various instances where the vehicle is not in motion still the fuel and battery of the vehicle is consumed. This happens because in most of the vehicles, there is no engine start stop mechanism. Hence, during idling condition in traffic, the vehicle will be kept running unless or until the customer switches off the ignition key or uses the kill switch in the vehicle to kill the engine. This leads to unwanted fuel consumption during vehicle idling condition.
[0003] However, there are vehicles with conventional auto start stop mechanism, the customer is mandatorily requested to shift the gear position to neutral for a successful auto stop and auto start to happen. With increasing traffic situations and the increasing idle stop and idle restart traffic scenarios, requesting customer to be in neutral for fuel efficiency is practically limiting the effective use of the idle start stop functionality and causes a huge inconvenience to customer.
BRIEF DESCRIPTION OF THE DRAWINGS
[0004] The detailed description is described with reference to an embodiment of a scooter type saddle vehicle along with the accompanying figures. The same numbers are used throughout the drawings to reference like features and components.
[0005] Figure 1 depicts a side view of an exemplary two-wheeled vehicle, in accordance with an embodiment of the present subject matter.
[0006] Figure 2 illustrates a block diagram explaining the interface of a controller (103) with different vehicular components according to an aspect of the present subject-matter.
[0007] Figure 3a and Figure 3b illustrates a flow chart to determine the controller logic to perform vehicle start-stop function according to an aspect of the present subject-matter.
[0008] Figure 4 illustrates a flow chart for throttle blip according to an aspect of the present subject-matter.
[0009] Figure 5 illustrates a method of controlling the engine for vehicle start and stop option according to an aspect of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[00010] Generally, when the vehicle is not in motion, a vehicle user ensures that the vehicle is in idling state where ignition will be cut off and the vehicle will be stopped automatically with the help of a controller actuator of the vehicle. This is done to conserve fuel and battery voltage. When the vehicle is in stop condition, the gears will disengage with the transmission system and the vehicle is in neutral position. When the vehicle restarts, a clutch is used to engage the gears. In conventional vehicles, a specific transmission state of the vehicle has to be determined for re-starting the vehicle.
[00011] Further, the behavior of engine operation during engine start and stop operation varies depends on various factors. Sometimes, while restarting the engine, there could be a sudden jerk in the vehicle. This happens because manual holding of the brake and opening of the throttle is applied by the user to restart the vehicle. Due to sudden jerk, the user may get panic and may lose control of the vehicle that can lead to accidents. This unintentional launch of vehicle could also be dangerous for the bystander standing near the vehicle.
[00012] Further, conventional system is employed to stop the engine when the vehicle temporarily stops at a stop signal or the like during a travel to a destination. However, as various controls are performed from the start of the engine stop control until re-start of the engine, a delay in the restarting of the vehicle may make the driver irritated because of the sense of delay.
[00013] Therefore, there exists a need of a system to control engine operation so that the vehicle can stop and start without any delay or safety risk. Further, a system is proposed in which the vehicle will restart irrespective of the transmission state while engaging the clutch. The system disclosed in the present invention will overcome all problems disclosed above as well as other problems of known art.
[00014] With the above objective in view, present invention discloses a vehicle employing a controller to determine the state of the engine and based on the determination, the controller will start and stop the vehicle efficiently without any safety risk to the user and the bystander.
[00015] In the present subject matter, the vehicle is configured with an integrated starter generator (ISG). The integrated starter-generator (ISG) replaces both the conventional starter and alternator (generator) of an automobile in a single electric device. It allows greater electrical generation capacity and the fuel economy and emissions benefits of hybrid electric automotive propulsion. ISG controller in a vehicle controls the ISG machine between motoring and generating modes, charging the battery and also facilitates the Idle Start Stop feature. ISG controller is communicatively connected to the engine management system (EMS) controller to receive various vehicle related inputs such as vehicle speed, throttle opening position, engine speed, battery voltage, vehicle riding pattern, engine temperature, clutch signal, brake signal, neutral signal, etc. With the help of these inputs ISG controller performs idle stop once the predetermined stop conditions are met and performs idle start once it receives throttle input and/or clutch input. In an embodiment, ISG controller determine cranking of engine through a crank position sensor and the engine rpm through the speed sensor, based on the inputs the ISG controller stops the engine or kills the engine. Further, ISG controller disables Idle start stop (ISS) feature when the vehicle is stopped in ISS stop for more than a predetermined time period. In addition to this ISG controller disables the ISS feature even when certain malfunctions are identified.
[00016] In automobiles, stop-start feature is used to automatically shut down and restart the internal combustion engine to reduce the amount of time the engine spends idling, thereby reducing emission and fuel consumption. The Integrated Starter Generator system (ISG) in a vehicle majorly comprises of ISG machine and ISG controller. The said ISG controller controls the ISG machine and performs the Idle Start Stop (ISS) function. ISG controller, being provided with various vehicle inputs, performs the idle stop start as per the predefined logic.
[00017] After satisfying the predetermined conditions the vehicle will enter into ISS mode and waits for the vehicle to satisfy all of its ISS stop conditions. The predetermined conditions are set of enabling conditions for ISS mode based on engine speed, engine temperature, distance travelled by said vehicle from last engine run to halt, transmission state of said vehicle, said one or more controller checking any system failure etc.
[00018] Here, any illuminating source such as lamp, LED, bulb etc. is provided on the vehicle which will start glowing thereby informing the user that the vehicle is in ISS mode. One or more controller will further check for one or more primary engine parameters which if met, the engine will be stopped due to ISS module provided within one or more controller and the illuminating source will start blinking at a predetermined frequency. The blinking illuminating source here signifies that the vehicle is stopped due to ISS Stop module. If the vehicle stays in ISS Stop mode more than a predetermined time duration, the illuminating source will glow consistently without blinking. It is proposed to perform ISS restart mode after an ISS stop mode with the help of clutch and/or throttle signals. In another embodiment, ISS restart mode after an ISS stop mode may be performed with the help of brake and/or throttle signals. Further, one or more primary engine parameters being based on an engine speed, an engine temperature, a distance travelled by said vehicle from last engine run to halt when said vehicle not being in motion for predefined time period, a transmission state of said vehicle, said clutch and said throttle being actuated manually etc.
[00019] Manual Clutch and/or manual throttle inputs by a vehicle user are communicatively connected to the ISG controller through a clutch sensor and/or throttle positioning sensor respectively. Once the engine is stopped after satisfying the primary engine parameters, the ISG controller will continuously check for both clutch and throttle signals which demonstrates a blip i.e., throttle sensor output value raises above a predetermined upper threshold value and falls below a predetermined lower threshold value within a predefined time wherein difference between the predetermined upper threshold value and the predetermined lower threshold value is in range of 4% to 10%. Here, a throttle valve is being closed and opened through a throttle grip provided on the handlebar assembly which is manually rotated by the user so that the throttle valve opens above a predetermined upper threshold value and closed below a predetermined lower threshold value. Providing manual clutch and throttle blip prevents the sudden launch of the vehicle. Hence, the value of the throttle is first raised beyond a predetermined threshold value and bringing it down below a predetermined lower threshold value will ensure that the vehicle smoothly comes into motion and there is no sudden start of the vehicle which can be dangerous for both vehicle user and bystander. In another embodiment, brake and/or throttle are communicatively connected to the ISG controller through a brake sensor and/or throttle positioning sensor respectively.
[00020] Configuring the system to work from other inputs may lead to increase in cost or impact the durability of the sensors/ switches, whereas clutch and throttle signals does not create any such situation and usage of two signals will help in reducing unintentional ISS restarts. Additionally, usage of clutch input during ISS restart will help the user to start the engine irrespective of the current transmission state of the vehicle.
[00021] ISS feature i.e., stopping the vehicle and starting the vehicle automatically during vehicle idling is performed by the ISG controller. ISG controller is also responsible for controlling the starting and charging system of the vehicle. ISS feature helps in reducing fuel consumption and in decreasing emission. This stop and start system work on the basis of the predefined logic for both ISS stop mode and ISS start mode.
[00022] When the ISS stop happens in the vehicle the ISG controller will wait for the Clutch and throttle blip inputs. The inputs are provided to the ISG controller through any communication protocol. With the help of these inputs ISG controller will automatically start the engine from ISS stop condition. When the inputs are not available for a predetermined duration, then the ISG controller will come out of the ISS mode and the user can start the vehicle using other starting means which are ignition key reset, electric start or attempting a kick start.
[00023] Addition to the clutch and/or throttle blip signals, the vehicle should be at rest for the ISG controller to perform ISS restart function. Vehicle being at rest means that the vehicle speed and the engine rpm both are zero and the vehicle is not in motion or not being dragged without switching on the ignition key by the user of the vehicle. Also, the ISG controller has a counter to count the number of failed starts if the failed start counter exceeds the predetermined count, then ISS start will be prohibited. The counter provided in the system may or may not be an inbuilt feature of ISG controller. The usage of two signals i.e., clutch and/or throttle blip will help in avoiding unintentional ISS restart. If only one signal is used then a case may arise where user provides the input signal without any intention to start. User may get into panic condition if sudden restart happens to the vehicle that is in an OFF state. Also, checking for the ‘Vehicle at rest’ condition during ISS module may restart the engine which helps in avoiding unintentional restart during uphill and downhill conditions also during traffic conditions.
[00024] Further, usage of clutch signal and throttle blip signal in ISS restart will help in starting the vehicle irrespective of the transmission state of the vehicle. Generally, when the engine of the vehicle is stopped due to ISS module, to restart the engine of the vehicle, inputs like brake or throttle are used, the user has to get the vehicle to neutral condition only then the ISS restart is performed. Hence, to avoid such inconvenience, as per the present invention, configuring usage of clutch and throttle input signal will help the user to perform ISS restart irrespective of the transmission state of the vehicle. In another embodiment, when the vehicle is in gear, clutch signal and throttle blip signal will help the user to re-start the engine but when the vehicle is in neutral, either one will suffice i.e., the engine can be re-started by providing clutch signal or just by providing a throttle signal. Unlike certain inputs, Clutch and throttle blip will help in providing the costumer a safe engine restart.
[00025] The summary provided above explains the basic features of the invention and does not limit the scope of the invention. The nature and further characteristic features of the present invention will be made clearer from the following descriptions made with reference to the accompanying drawings. The present subject matter is further described with reference to the accompanying figures. It should be noted that 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.
[00026] Figure 1 depicts a front perspective view of an exemplary two-wheeled vehicle (100), in accordance with an embodiment of the present subject matter with few parts of the vehicle omitted for clarity. The vehicle (100) has an integrated starter generator (ISG). The integrated starter-generator (ISG) replaces both the conventional starter and alternator (generator) of an automobile in a single electric device. ISG controller (103) in a vehicle controls the ISG machine between motoring and generating modes, charging the battery and also facilitates the Idle Start Stop feature. ISG controller (103) is communicatively connected to the engine management system (EMS) controller (201) to receive various vehicle related inputs such as vehicle speed, throttle opening position, engine speed, battery voltage, vehicle riding pattern, engine temperature, clutch signal, brake signal, neutral signal, etc. With the help of these inputs ISG controller (103) performs idle stop once predetermined conditions and one or more primary engine parameters are met and performs idle start once it receives throttle input from throttle position sensor (102) and/or clutch input from clutch sensor (101). Further, one or more predetermined conditions being based on an engine speed, an engine temperature, a distance travelled by said vehicle from last engine run to halt, transmission state of said vehicle, said one or more controller checking any system failure etc. said one or more primary engine parameters being based on an engine speed, an engine temperature, a distance travelled by said vehicle from last engine run to halt, said vehicle not being in motion for predefined time period, transmission state of said vehicle, said clutch and said throttle being actuated manually etc.
[00027] Figure 2 illustrates a block diagram explaining the interface of a controller (103) with different vehicular components. A handlebar assembly (105) comprises of the throttle position sensor (102) and a clutch sensor (101). Controller (103) is communicatively connected to the engine management system (EMS) controller (201) to receive various vehicle (100) related inputs such as vehicle (100) speed, throttle opening position, engine speed, battery voltage, vehicle (100) riding pattern, engine temperature, clutch signal, brake signal, neutral signal, etc. With the help of these inputs, controller (103) performs idle stop once the predetermined stop conditions are met and performs idle start once it receives throttle input (102) and/or clutch input (101). Predetermined conditions can be analysed with the help of variety of sensors including engine temperature sensor (203), crank position sensor (204), speed sensor (206), gear sensor (205). The controller (103) will perform the start stop function with the help of starter generator (202). In an embodiment, controller (103) may determine cranking of engine through a crank position sensor (204) and the engine rpm through the speed sensor (206), controller (103) stops the engine (104) or kills the engine (104). Further, controller (103) disables Idle start stop (ISS) module when the engine (104) is stopped in ISS stop for more than a predetermined time period. In addition to this controller (103) disables the ISS module even when certain malfunctions are identified.
[00028] Figure 3a and figure 3b illustrates a flow chart to determine the controller logic to perform vehicle start-stop function. As soon as ignition key is ON (step 301). The controller determines if the ignition start stop (ISS) conditions which are set of pre-determined conditions, provided by the manufacturer, are met (step 302). As soon as the conditions are satisfied, the vehicle will go in ISS mode which will be indicated through an ISS lamp or any other illuminating source (step 303). Further, the controller checks if ISS stop condition are satisfied (step 304). Here, ISS stop conditions are satisfied if one or more primary engine parameters are satisfied. If the conditions are satisfied, the engine is stopped (step 305). This will be indicated by blinking of the ISS lamp or any other illuminating source at a particular frequency (step 306). The vehicle is now in stop state. For restarting the vehicle, the controller will determine if the vehicle is at rest condition (step 307). Further, a manual throttle and/or manual clutch transmission is provided by the user and if the system fails to restart the vehicle, a counter will be updated. If the value of counter is less than predetermined value (step 308) then clutch and/or throttle blip inputs are checked again (step 309). If the value of counter is more than predetermined value (step 308) then the controller will disable ISS module (step 311). If the value of clutch and/or throttle blip is “1” then engine will start through ISS (step 313). Failed start counter is updated if engine is not starting (step 314) and the controller will return to run commands from step 302. If the clutch and throttle blip is “0”, and the manual throttle and/or clutch is not provided by the user within a pre-determined time (step 310) then the controller will disable ISS module (step 311). After, ISS module being disabled by the controller, the user has to manually start the vehicle by resetting the ignition key, by electric start switch or by kick start (step 312). The entire logic will again start from the top as soon as vehicle is re-started.
[00029] Figure 4 illustrates a flow chart for throttle blip. Whenever, the ignition switch is ON (step 401), the throttle position sensor will check if the throttle is actuated manually and if it is actuated manually, “1” value will be sent to the controller signifying the actuation of manual throttle else “0” value will be sent (step 402). As soon as, throttle is actuated, a throttle blip will be initiated (step 403). During a throttle blip, an opening of throttle valve will be checked by the controller, if the opening of throttle valve has crossed predetermined upper threshold value “x”. If the value has not crossed the predetermined upper threshold value, the controller will get a “0” value. If the value has crossed the predetermined upper threshold value then immediately the controller will check if closing of throttle valve is below the lower threshold value “y”. The controller will analyse the throttle value raising above the upper threshold value and falling below the lower threshold value in a pre-determined time duration. If this process is followed successfully, throttle blip will be “1”, otherwise it will be “0”.
[00030] Figure 5 illustrates a method of controlling the engine for vehicle start and stop option. Firstly, the controller will detect an engine operating mode based on pre-determined conditions and one or more primary engine parameters wherein the engine operating mode includes idle stop and idle start mode. The controller will check the one or more primary engine parameters to analyse if idle start stop feature provided in the vehicle should be initiated (step 501). Further, the controller is communicatively connected to the engine management system (EMS) controller to receive various vehicle related inputs such as vehicle speed, throttle opening position, engine speed, battery voltage, vehicle riding pattern, engine temperature, clutch signal, brake signal, neutral signal, etc. With the help of one or more of these inputs, the controller performs idle stop once the predetermined stop conditions are met. In an embodiment, controller determines cranking of engine through a crank position sensor and/or the engine rpm through the speed sensor, based on the inputs the controller stops the engine or kills the engine. (step 502). The controller will check if the vehicle is in rest position and is stationary. If so, the controller checks one or more secondary engine parameters and based on the one or more secondary engine parameters, the controller will decide to restart the vehicle. Here, the one or more secondary parameters are throttle input and/or clutch input or throttle input and/or brake input that is provided through manual transmission by the user (step 503).
[00031] It is to be understood that the aspects of the embodiments are not necessarily limited to the features described herein. Many modifications and variations of the present subject matter are possible in the light of above disclosure.

LIST OF NUMERALS:
100- vehicle
101- clutch sensor
102- throttle position sensor
103-controller
104-engine
105-handlebar assembly
201-engine management system controller
202-strater generator
203-engine temperature sensor
204-crank position sensor
205-neutral switch
206-speed sensor
301-314-steps in flow chart to determine logic for controller
401-408-steps in flow chart to determine a throttle blip
501-503-steps to identify the method of the system to operate engine start-stop condition
,CLAIMS:I/We claim:
1. An Integrated Start Stop (ISS) system for restarting operation an engine of a vehicle (100) comprising:
one or more controller (103) having an idle start stop module, said one or more controller (103) being configured to stop said engine (104) on detecting one or more primary engine parameters, said one or more controller (103) being configured for detecting said engine operating mode and re-starting said engine (104);
a throttle position sensor (102) being configured for detecting an operation of a manual throttle of said vehicle (100) and providing a throttle value input signal to said one or more controller (103) as one of a secondary engine parameter;
a clutch actuation sensor (101) being configured for detecting an operation of a manual clutch of said vehicle (100) and providing a clutch value input signal to said one or more controller (103) as one of a secondary engine parameter;
wherein,
said one or more controller (103) being configured to check one or more secondary engine parameters and capable of restarting said engine (104) based on said one or more secondary engine parameters meeting a predetermined condition (s) of each of said one or more secondary engine parameters.

2. The system as claimed in claim 1, wherein said engine operating mode being idle start stop mode to restart said engine (104).

3. The system as claimed in claim 1, wherein said one or more secondary parameter includes one or more of said throttle value input and said clutch value input from said at least one of a throttle position sensor (102) and said clutch actuation sensor (101).

4. The system as claimed in claim 3, wherein said one or more controller (103) being configured for determining throttle blip based on an input of said throttle position sensor (102).

5. The system as claimed in claim 4, wherein said throttle blip occurs when a throttle valve being opened above a predetermined upper threshold value and said throttle valve being closed below a predetermined lower threshold value, said throttle valve opening being within a pre-determined time duration.

6. The system as claimed in claim 5, wherein difference between said predetermined upper threshold value and said predetermined lower threshold value being in a range of 4% to 10% of complete range of said throttle value.

7. The system as claimed in claim 1, wherein said one or more controller (103) determines a rest state of said vehicle (100) and based on said determination, said one or more controller (103) enabling re-start of said engine (104).

8. The system as claimed in claim 1, wherein said vehicle (100) being provided with an illuminating source, said illuminating source being configured for indicating said engine operating mode being an ISS start mode or an ISS stop mode.

9. The system as claimed in claim 1, wherein said one or more controller (103) being configured to count number of failed attempts of restarting said engine (104); and on determination of number of failed attempts of restarting said engine (104) being more than a predetermined value, said one or more controller (103) disabling said idle start stop mode and indicating said mode to a user of said vehicle (100) through said illuminating source.

10. The system as claimed in claim 9, wherein number of failed attempts of restarting said engine (104) being more than a predetermined value, said one or more controller (103) will disable said idle start stop module and indicate user of said vehicle (100) through said illuminating source.

11. The system as claimed in claim 1, wherein said one or more controller (103) being configured to stop said engine operation of said vehicle (100) based on a one or more predetermined conditions and a one or more primary engine parameters, said one or more primary engine parameters being determined from outputs of a crank position sensor (204), speed sensor (206), an engine temperature sensor (203), a neutral switch sensor (205), said throttle position sensor (102) and said clutch actuation sensor (101)

12. The system as claimed in claim 11, wherein said one or more predetermined conditions being a one or more secondary engine parameters, said one or more secondary engine parameters being an engine speed, an engine temperature, a distance travelled by said vehicle (100) from last engine to halt, a transmission state of said vehicle (100), a system failure state; wherein said one or more predetermined conditions being an engine speed being greater than a predetermined engine speed, an engine temperature being above a threshold temperature, a distance travelled by said vehicle (100) from last engine run to halt being greater a predetermined distance, a transmission state of said vehicle (100) being a predetermined state, said predetermined state being one of a gear engaged state or a neutral state, said one or more controller (103) determining any system failure.

13. The system as claimed in claim 10, wherein said one or more primary engine parameters being one or more of an engine speed, an engine temperature, a distance travelled by said vehicle (100) from last engine run to halt, said vehicle (100) not being in motion for predefined time period, transmission state of said vehicle (100), said manual clutch and said manual throttle being actuated.

14. The system as claimed in claim 1, wherein said one or more controller (103) restarts said engine (104) based on inputs from said throttle position sensor (102) and said clutch actuation sensor (101) when said vehicle (100) being in a gear engaged state, and said one or more controller (103) restarts said engine (104) based on inputs from said throttle position sensor (102) when said vehicle (100) being in a neutral state.

15. The system as claimed in claim 1, wherein said one or more controller (103) restarts said engine (104) based on inputs from said throttle position sensor (102) and said clutch actuation sensor (101) when said vehicle (100) being in an gear engaged state, and said one or more controller (103) restarts said engine (104) based on inputs from said clutch actuation sensor (101) when said vehicle (100) being in an neutral state.

16. The system as claimed in claim 1, wherein said one or more controller (103) re-starts said engine (104) based on inputs from said throttle position sensor (102) and said clutch actuation sensor (101).

17. A controller (103) for controlling operation an engine of a vehicle (100), said controller (103) being configured with an Idle Start Stop module, said controller (103) comprising a method for starting and stopping said an Idle Start Stop mode, said method having following steps:
detecting an engine operating mode by said Idle Start Stop module based on a one or more pre-determined conditions and a one or more primary engine parameters,
stopping said vehicle (100) by said Idle Start Stop module stops based on said pre-determined conditions being met and said one or more primary engine parameters meeting a one or more predetermined threshold values,
checking one or more secondary engine parameters by said Idle Start Stop module against a one or more predetermined values,
determining meeting of said predetermined conditions based on said checking of said one or more secondary engine parameters; and
restarting said engine (104) based on said meeting said one or more predetermined conditions.

18. The controller unit as claimed in claim 16, wherein said engine operating mode being an idle start stop mode to restart said engine (104).

19. The controller unit as claimed in claim 16, wherein said one or more predetermined conditions being a one or more secondary engine parameters, said one or more secondary engine parameters being an engine speed, an engine temperature, a distance travelled by said vehicle (100) from last engine run to halt, a transmission state of said vehicle (100), a system failure state; wherein said one or more predetermined conditions being an engine speed being greater than a predetermined engine speed, an engine temperature being above a threshold temperature, a distance travelled by said vehicle (100) from last engine run to halt being greater a predetermined distance, a transmission state of said vehicle (100) being a predetermined state, said predetermined state being one of a gear engaged state or a neutral state, said one or more controller (103) determining any system failure .

20. The controller unit as claimed in claim 16, wherein said one or more primary engine parameters being one or more of an engine speed, an engine temperature, a distance travelled by said vehicle (100) from last engine run to halt, said vehicle (100) not being in motion for predefined time period, transmission state of said vehicle (100), said manual clutch and said manual throttle being actuated.

21. The controller unit as claimed in claim 16, wherein said one or more secondary parameter comprises of input value of at least one of a throttle position sensor (102) and a clutch actuation sensor (101).

22. The controller unit as claimed in claim 20, wherein a throttle blip being detected by said one or more controller (103) based on an input value of said throttle position sensor (102).

23. The controller unit as claimed in claim 21, wherein said throttle blip occurs when a throttle valve being opened above a predetermined upper threshold value and said throttle valve being closed below a predetermined lower threshold value, said throttle valve opening being within a pre-determined time duration.

24. The controller unit as claimed in claim 22, wherein difference between said predetermined upper threshold value and said predetermined lower threshold value being in a range of 4% to 10% of complete range of said throttle value.

25. The controller unit as claimed in claim 16, wherein said vehicle (100) being at rest for said one or more controller (103) to restart said vehicle (100).

26. The controller unit as claimed in claim 16, wherein said one or more controller (103) controls an illuminating source, said illuminating source being configured for indicating said engine operating mode being an ISS start mode or an ISS stop mode.

27. The controller unit as claimed in claim 16, wherein said one or more controller (103) being configured to count number of failed attempts of restarting said engine (104); and on determination of number of failed attempts of restarting said engine (104) being more than a predetermined value, said one or more controller (103) disabling said idle start stop mode and indicating said mode to a user of said vehicle (100) through said illuminating source.

28. A method for controlling operation of an engine (104) of a vehicle (100), said method implemented in a one or more controller (103) of said vehicle (100), said method comprising steps of:
determining an engine operating mode being one of an ISS ON mode or ISS OFF mode, said determination being by said one or more controller (103) and being based on one or more pre-determined conditions and a one or more primary engine parameters,
stopping said engine (104) by said one or more controller (103) in an ISS stop mode, based on said pre-determined conditions being met and said one or more primary engine parameters meeting a one or more predetermined threshold values,
checking one or more secondary engine parameters by said one or more controller (103); and
restarting of said engine (104) by said one or more controller (103) in an ISS start mode based on meeting one or more predetermined conditions.

29. The method as claimed in claim 28, said method comprising steps of:
,
indicating to a user of said vehicle (100), by said one or more controller (103), said engine operating mode being one of an ISS ON mode and an ISS OFF mode, through an illuminating source,
determining, by said one or more controller (103), an engine operating mode being an ISS stop mode,
determining, by said one or more controller (103) whether said vehicle (100) being at rest,
counting, by said one or more controller (103), a number of failed restarts being less than a predetermined value,
restarting of said engine (104) in an ISS start mode based, by said one or more controller (103) when a manual clutch or a manual throttle or both being actuated by a user, said actuation meeting a one or more pre-defined condition,
updating number of failed said engine re-starts, by said one or more controller (103),
disabling said ISS mode from restarting said engine (104) when a number of failed attempts to restart said engine (104) being more than pre-determined value or when a time taken to restart being more than pre-defined time,
indicating to said user of said vehicle (100), by said one or more controller (103), said ISS mode through said illuminating source, and
enabling restarting of said engine (104) by one of an electric switch, a kick start and by resetting ignition key.

30. The method as claimed in claim 28, wherein said engine operating mode being idle start stop ON mode.

31. The method as claimed in claim 28, wherein said one or more predetermined conditions being a one or more secondary engine parameters, said one or more secondary engine parameters being an on engine speed, an engine temperature, a distance travelled by said vehicle (100) from last engine run to halt, a transmission state of said vehicle (100), a system failure state; wherein said one or more predetermined conditions being an engine speed being greater than a predetermined engine speed, an engine temperature being above a threshold temperature, a distance travelled by said vehicle (100) from last engine run to halt being greater a predetermined distance, a transmission state of said vehicle (100) being a predetermined state, said predetermined state being one of a gear engaged state or a neutral state, said one or more controller (103) determining any system failure .

32. The method as claimed in claim 28, wherein said one or more primary engine parameters being one or more of an engine speed, an engine temperature, a distance travelled by said vehicle (100) from last engine run to halt, said vehicle (100) not being in motion for predefined time period, transmission state of said vehicle (100), said manual clutch and said manual throttle being actuated.

33. The method as claimed in claim 28, wherein said one or more secondary engine parameters being an input of at least one of a clutch actuation sensor (101) and a throttle position sensor (102), said throttle position sensor (102) being configured to detect a throttle blip.

34. The method as claimed in claim 28, wherein restarting of said engine (104), by said one or more controller (103) being based on actuation of a manual clutch and a manual throttle when said vehicle (100) being in a gear engaged state.

35. The method as claimed in claim 28, wherein restarting of said engine (104), by said one or more controller (103) being based on actuation of a manual clutch when said vehicle (100) being in a neutral state.

36. The method as claimed in claim 28, wherein restarting of said engine (104), by said one or more controller (103) being based on actuation of a manual throttle when said vehicle (100) being in a neutral state.

37. The method as claimed in claim 33, wherein said throttle blip occurs when a throttle valve being opened above a predetermined upper threshold value and said throttle being closed below a predetermined lower threshold value, said throttle valve opening being within a pre-determined time duration.

38. The method as claimed in claim 37, wherein difference between said predetermined upper threshold value and said predetermined lower threshold value being in a range of 4% to 10% of complete range of said throttle value.