DESC:TECHNICAL FIELD
[0001] The present invention relates generally to a hybrid assist system. More specifically, but not exclusively the present invention relates to a hybrid assist system for a vehicle enabling selective charging and discharging of a battery assemblies of the vehicle.
BACKGROUND
[0002] Nowadays, with increasing global warming, depletion of fossil fuels, there is advancement in the technology such as an electric or hybrid electric based systems. For example, an electric vehicle or hybrid vehicles uses one or more battery packs that provides electrical power to run a motor which in turn rotates one or more wheels of the vehicle. To meet the demand of high-power vehicles for longer operation, usage of lithium-ion batteries has increased due to their high energy storing capacity. In general, batteries with different voltage specification are used for meeting the requirement of the electrical load and efficient operation of the engine. In general, a hybrid electric vehicle is powered by an internal combustion engine and an electric motor, which uses energy stored in batteries.
[0003] In the last decades the automotive industry has been investigating alternatives to conventional internal combustion engine powered vehicles to improve their fuel efficiency and to reduce emission of greenhouse gases. In the current challenging times having limited availability of fossil fuels, a hybrid vehicle and electric vehicle is in high demand. A hybrid vehicle comprises an internal combustion engine, a traction motor, a starter motor, and a battery bank, wherein all the components work in sync to meet the vehicle's instantaneous torque demands so that the vehicle can run in optimum efficiency. Nowadays an integrated starter-generator (ISG) is used in hybrid vehicle which replaces both the conventional starter and alternator (generator) of an automobile in a single electric device. It allows greater electrical generation capacity along with fuel economy and emissions benefits of hybrid electric automotive propulsion.
[0004] As per known state of art, one or more battery is used for powering the vehicle and meeting the requirements of electrical loads such as headlamp, TSL, horn etc. In hybrid vehicle the battery is charged through regenerative mode and by the internal combustion engine (IC). The extra power provided by the electric motor can potentially allow for a smaller engine. The battery can also power auxiliary loads and reduce engine idling when stopped. Together, these features result in better fuel economy without sacrificing performance.
[0005] A hybrid vehicle comprises an integrated starter generator (ISG) machine, a ISG controller and one or more batteries. The ISG machine acts as a bi-directional power converter, changing mechanical energy into electrical energy and vice versa. Functioning as an electric motor, it starts the engine almost soundlessly and considerably faster than any conventional starter. As a generator, it produces power for the lights, battery charging, and all other electrical elements in the vehicle, with higher efficiency than other conventional systems. Primarily two batteries having different voltage specifications are used to meet the requirements of powering the vehicle as well as powering the electrical and electronic loads of the vehicle simultaneously. A first battery, usually having higher voltage capacity and a second battery, having a lower voltage capacity than the first battery is used for function of the vehicle. The second battery having lower voltage typically provides power to the electrical loads of the vehicle, and the first battery provides electrical energy to drive the motor for powering the engine which enables running of the vehicle.
[0006] The first and second batteries of such hybrid vehicle are charged either by plug in charger mechanism or the batteries can be charged while the vehicle is operating or running condition. While the vehicle is operating through a fuel/gasoline, the ISG machine acts as generator, which generates electric energy to charge the battery having higher voltage i.e., the first battery. Subsequently, the second battery is charged by the first battery after stepping down the voltage using a voltage convertor for example a DC-DC convertor. The charging of the second battery by the first battery uses an additional element i.e., the voltage convertor, which eventually adds to the complexity of the circuit, increased maintenance, increased weight with increased cost of production.
[0007] Additionally, since the voltage converter is stepping down the voltage of the first battery for charging the second battery, a significant amount of heat is generated. The heat decreases the durability of the batteries, thereby affecting the overall performance of the vehicle. To reduce the effect of the heat produced, a heat sync element is used to maintain the temperature. However, the heat sync element is an additional element, which further adds to significantly to the complexity of the circuit, demanding more maintenance, and cost of manufacturing.
[0008] In conventional vehicles, the ISG controller is provided inside the vehicle for initiating smooth and faster starting of an internal combustion engine of the vehicle. The ISG controller enables a permanent magnet machine of the vehicle to provide optimum starting torque to the vehicle and thereafter the vehicle runs smoothly on a power provided by the internal combustion engine. Another function of the ISG controller is to charge the first battery only. Hence, the utility of the ISG controller is limited to only cranking and charging the second battery.
[0009] Keeping in mind the above challenges, it is extremely crucial to efficiently charge both the batteries with minimal number of elements and components. Further limitations and disadvantages of conventional and traditional approaches will become apparent to one of skill in the art, through comparison of described systems with some aspects of the present disclosure, as set forth in the remainder of the present application and with reference to the drawings.
SUMMARY
[00010] According to an embodiment of the invention, a hybrid assist system for a vehicle comprises a first battery assembly; a second battery assembly, at least one of the first battery assembly and second battery assembly being configured to power the vehicle and one or more vehicle electrical loads. The system also comprises a controller electrically coupled to the first battery assembly and the second battery assembly through one or more switches. The controller is configured to control an operating mode associated with the first battery assembly and the second battery assembly based on an operating condition of the vehicle. The operating mode is one of a charging mode and a discharging mode of the first battery assembly and the second battery assembly. The controller is configured to selectively toggle one or more switches based on operating condition of the vehicle to control the operating mode associated with the first battery assembly and the second battery assembly. In the charging mode the controller is configured to charge at least selectively directly one of the first battery assembly and second battery assembly through operation of the one or more switches; and in the discharging mode, the controller is configured to enable selectively directly discharge at least one of the first battery assembly and the second battery assembly.
[00011] As per an aspect of the present invention, the one or more switches comprises a first switch and a second switch, wherein the first battery assembly is electrically coupled to the controller through the first switch, and second battery assembly being electrically coupled to the controller through the second switch.
[00012] As per an aspect of the present invention, controlling the operating mode comprises enabling discharging of the first battery assembly by closing the first switch and opening the second switch, during an engine cranking condition, or the vehicle being in a hybrid assist mode.
[00013] As per an aspect of the present invention, controlling the operating mode comprises enabling direct charging of at least one of the first battery assembly and second battery assembly by closing the first switch and the second switch during vehicle running condition.
[00014] As per an aspect of the present invention, controlling the operating mode comprises closing the first switch and opening the second switch to enable charging of the first battery assembly during application of a regenerative mode in the vehicle.
[00015] As per an aspect of the present invention, the vehicle includes a vehicle propelling machine, the vehicle propelling machine being operably connected to the controller, wherein the first battery assembly being configured to discharge power to the vehicle propelling machine through the controller and the second battery assembly being configured to power the one or more vehicle electrical loads.
[00016] As per an aspect of the present invention, the vehicle propelling machine being an integrated stater generator.
[00017] As per an aspect of the present invention, the vehicle running condition is when the vehicle is in the running condition at a predefined speed, wherein the predefined speed is more than 5 Kmph.
[00018] As per an aspect of the present invention, the controller disconnects the first battery assembly and the second battery assembly by opening the first switch and the second switch during in vehicle sleep mode, wherein the vehicle sleep mode sleep comprises at least one of the ignition OFF condition and the vehicle being inoperative for more than a pre-defined time.
[00019] As per an aspect of the present invention, the pre-defined time being equal to or more than 15 minutes.
[00020] As per an aspect of the present invention, the first battery assembly and the second battery assembly being equal capacity batteries.
[00021] As per an aspect of the present invention, controller determines an operating condition of the vehicle based on inputs from a plurality of sensors of the vehicle.
[00022] As per an embodiment of the present invention, a method for providing a hybrid assist to a vehicle, the method comprising steps of: receiving, by a controller an ignition status of the vehicle; determining, by the controller, an operating condition of the vehicle based on inputs from a plurality of sensors; controlling, by the controller, an operating mode associated with the first battery assembly and the second battery assembly based on an operating condition of the vehicle, wherein the operating mode is one of a charging mode and a discharging mode of the first battery assembly and the second battery assembly, wherein controlling comprises selectively toggle one or more switches based on operating condition of the vehicle to enable selective direct charging of at least one of the first battery assembly and second battery assembly.

BRIEF DESCRIPTION OF THE DRAWINGS
[00023] The present invention is described with reference to a hybrid assist system of a vehicle, for an exemplary embodiment along with the accompanying drawings. The same numbers are used throughout the drawings to refer to similar features and components.
[00024] Fig. 1 exemplarily illustrates a block diagram of the essential elements of the hybrid assist system of the vehicle in accordance with an embodiment of the present invention.
[00025] Fig. 2A and 2B exemplarily illustrates a flow chart of method of hybrid assist for the vehicle in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION
[00026] The present disclosure may be best understood with reference to the detailed figures and description set forth herein. Various embodiments are discussed below with reference to the figures. However, those skilled in the art will readily appreciate that the detailed descriptions given herein with respect to the figures are simply for explanatory purposes as the methods and systems may extend beyond the described embodiments. For example, the teachings presented, and the needs of a particular application may yield multiple alternative and suitable approaches to implement the functionality of any detail described herein. Therefore, any approach may extend beyond the particular implementation choices in the following embodiments described and shown.
[00027] References to “one embodiment,” “at least one embodiment,” “an embodiment,” “one example,” “an example,” “for example,” and so on indicate that the embodiment(s) or example(s) may include a particular feature, structure, characteristic, property, element, or limitation but that not every embodiment or example necessarily includes that particular feature, structure, characteristic, property, element, or limitation. Further, repeated use of the phrase “in an embodiment” does not necessarily refer to the same embodiment.
[00028] The present invention now will be described more fully hereinafter with different embodiments. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather those embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the invention to those skilled in the art.
[00029] Therefore, the objective of the present invention is to provide a hybrid assist system for a vehicle which can successfully overcome the above cited disadvantages of the conventional art. In other words, the the objective of the present invention is to provide a mechanism to efficiently operate a hybrid vehicle by efficient charging of one or more batteries of the vehicle without usage of additional parts, to eliminates the complexity, high maintenance, and cost of production of the electrical circuit, and eventually the vehicle. The present subject matter further aims to provide a compact, safe to operate, easy to manufacture, assemble, and service hybrid assist system for the vehicle.
[00030] The present subject matter is further described with reference to the accompanying figures. It should be noted that the description and figures merely illustrate the 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.
[00031] The foregoing disclosure is not intended to limit the present disclosure to the precise forms or fields of use disclosed. As such, it is contemplated that various alternate embodiments and/or modifications to the present disclosure, whether explicitly described or implied herein, are possible considering the disclosure. Having thus described embodiments of the present disclosure, a person of ordinary skill in the art will recognize that changes may be made in form and detail without departing from the scope of the present disclosure. Thus, the present disclosure is limited only by the claims.
[00032] Fig 1 exemplarily illustrates a block diagram of the essential elements of the hybrid assist system for the vehicle in accordance with an embodiment of the present invention. The hybrid assist system (100), hereinafter referred as system comprises of a vehicle propelling machine (102), sometime interchangeably referred as a machine. The machine is an integrated starter generator machine (ISG) which function as a generator and a motor depending on the vehicle running condition. The machine (102) is operably connected to a controller (104). The controller (104) comprises of a one or more switches (104a, 104b). The one or more switches (104a,104b) comprises of a first switch (104a) and a second switch (104b). The system (100) also comprises of a first battery assembly (106) and a second battery assembly (108). The first battery assembly (106) and the second battery assembly (108) are used to power an engine (not shown) and an electrical and electronic load (110) of the vehicle respectively. The controller (104) (104) is electrically coupled to the first battery assembly (106) and the second battery assembly (108) through one or more switches (104a,104b). The electrical coupling of the first battery assembly (106) and the second battery assembly (108) through the one or more switches (104a,104b), enables the controller (104) to selectively charge and discharge the battery assemblies instantaneously as per running mode of the vehicle. More particularly, the first battery assembly (106) is coupled to the controller (104) through the first switch (104a). Similarly, the second battery assembly (108) is coupled to the controller (104) through the second switch (104b). The machine (102) at times generates power to rotate wheels (not shown) of the vehicle, and at times the machine (102) generates power to charge the battery assemblies (106,108), thereby assists to drive other electrical and electronic loads of the vehicle. More certainly, the controller (104) is a bridge between the battery assemblies (106,108) and the machine (102).
[00033] The controller (104) is configured to charge and discharge the first battery assembly first battery assembly (106) and the second battery assembly (108) based on the operating condition of the vehicle. The first battery assembly (106) and the second battery assembly (108) are operated through operation of the one or more switches (104a, 104b). The controller (104) by toggling the first switch (104a) and the second switch (104b) enables selective direct discharging of the first battery assembly (106) and the second battery assembly (108). The charging mode and the discharging mode of the first battery assembly and the second battery assembly (108) is elaborately explained in the fig. 2 A and 2B. As per an embodiment of the present invention the first battery assembly (106) is configured to discharge power to the machine (102) through the controller (104), while the second battery assembly (108) is configured to discharge power to one or more vehicle electrical loads (110).
[00034] Fig. 2A and 2B exemplarily illustrates a flow chart of method of the hybrid assist system of the vehicle in accordance with an embodiment of the present invention. After the vehicle’s ignition is switched on at step 200, the engine is cranked at step (202). For cranking the engine efficiently, it is important to provide sufficient power to the engine. Thus, during cranking stage, the controller (104) closes the first switch (104a), and opens the second switch (104b) to discharge the first battery. This enables the power from the first battery to be directed to the machine (102). During the engine cranking condition at step 202, the second switch (104b) (104b) is in open condition state at step (206). However, if the vehicle’s ignition is ON at step 202, but the vehicle is inactive for more than a predefined time (T1) i.e., 15 minutes, the vehicle is in a sleep mode at step (208). At sleep mode of the controller both the first switch (104a) and the second switch (104b) are in open condition, thereby no power is transferred to or from the first battery and the second battery. An ignition key toggle is required to awaken the controller (104) for activation of one or more switches (104a, 104b).
[00035] Further, after cranking operation at step 206 this stage, if the vehicle is in running mode at step (210), the machine (102) acts as a generator producing electrical energy. If the vehicle running condition is in running condition as per step 210, the controller (104) closes the first switch (104a) and the second switch (104b) at step (212). Thus, at step 212 it is ensured that the first battery assembly (106) and the second battery assembly (108) are charging from the power being generated by the machine (102) simultaneously. As per an embodiment of the present invention the first battery assembly (106), and the second battery assembly (108) are of equal voltage capacity.
[00036] In hybrid assist mode, the machine (102) also provides assist to the engine by providing additional power in scenarios such as accelerating, overtaking, or hill climbing. If the hybrid assist mode is activated as per step 214, the controller closes the first switch (104a), and opens the second switch (104b), to enable discharge of power from the first battery assembly (106) to the machine (102). Further, if the vehicle is in regenerative mode at step 216, high amount of energy is generated by the machine (102). The energy generated during the regenerative mode by application of brakes can used to charge the first battery assembly (106). Thus, if the vehicle is in regenerative mode at step 216, the controller (104) is configured to close the first switch (104a) and the second switch (104b) is opened at step (220). As per an aspect of the present invention, the controller (104) receives inputs relating vehicle operating condition from a plurality of sensors such as vehicle speed sensors, vehicle brake sensing sensors, vehicle ignition sensors and the like.
[00037] Thus, advantageously, the controller (104) is configured to selectively charge and discharge the one or more battery assemblies based on the vehicle running condition without use of additional elements. Thus, the complexity of the electrical connection is eliminated, thereby saving in maintenance, economic cost, man-hour, assembly time. This also ensure the invention can be accomplish by existing layout of the vehicle.
[00038] Further, the selective charging and discharging of the one or more battery assemblies is important to enable efficient and optimum charging and discharging of the one or more battery assemblies based on the requirements. For example, during cranking of the engine it is important to provide sufficient power to the engine, thus the controller (104) is configured to selectively discharge the power from the first battery assembly (106), while disconnecting the second battery assembly (108). Similarly, the controller (104) is configured to selectively charge the first battery assembly (106) during regenerative mode condition, to enable charging of the first battery only.
[00039] In light of the above-mentioned advantages and the technical advancements provided by the disclosed method and system, the claimed steps as discussed above are not routine, conventional, or well understood in the art, as the claimed steps enable the following solutions to the existing problems in conventional technologies. Further, the claimed steps clearly bring an improvement in the functioning of the guard assembly itself as the claimed steps and constructional features provide a technical solution to a technical problem.
[00040] Finally, the language used in the specification has been principally selected for readability and instructional purposes, and it may not have been selected to delineate or circumscribe the inventive subject matter and is therefore intended that the scope of the invention be limited not by this detailed description, but rather by any claims that issue on an application based here on. Accordingly, the embodiments of the present invention are intended to be illustrative, but not limiting, of the scope of the invention, which is set forth in the following claims.
[00041] 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.
[00042] A person with ordinary skills in the art will appreciate that the systems, modules, and sub-modules have been illustrated and explained to serve as examples and should not be considered limiting in any manner. It will be further appreciated that the variants of the above disclosed system elements, modules, and other features and functions, or alternatives thereof, may be combined to create other different systems or applications.
[00043] Those skilled in the art will appreciate that any of the aforementioned steps and/or system modules may be suitably replaced, reordered, or removed, and additional steps and/or system modules may be inserted, depending on the needs of a particular application. In addition, the systems of the aforementioned embodiments may be implemented using a wide variety of suitable processes and system modules, and are not limited to any particular computer hardware, software, middleware, firmware, microcode, and the like. The claims can encompass embodiments for hardware and software, or a combination thereof.
[00044] While the present disclosure has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the present disclosure. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from its scope. Therefore, it is intended that the present disclosure not be limited to the particular embodiment disclosed, but that the present disclosure will include all embodiments falling within the scope of the appended claims.

,CLAIMS:I/We claim:
1. A hybrid assist system (100) for a vehicle, the hybrid assist system (100) comprises:
a first battery assembly (106);
a second battery assembly (108),
at least one of the first battery assembly (106) and second battery assembly (108) being configured to power the vehicle and one or more vehicle electrical load (110);
a controller (104), the controller (104) being electrically coupled to the first battery assembly (106) and the second battery assembly (108) through one or more switches;
wherein, the controller (104) being configured to control an operating mode associated with the first battery assembly (106) and the second battery assembly (108) based on an operating condition of the vehicle,
wherein the operating mode being one of a charging mode and a discharging mode of the first battery assembly (106) and the second battery assembly (108),
wherein the controller (104) being configured to selectively toggle one or more switches based on operating condition of the vehicle to control the operating mode associated with the first battery assembly (106) and the second battery assembly (108);
wherein in the charging mode, the controller (104) being configured to selectively directly charge at least one of the first battery assembly (106) and second battery assembly (108) through operation of the one or more switches; and
wherein in the discharging mode, the controller (104) is configured to enable selectively directly discharge at least one of the first battery assembly (106) and the second battery assembly (108).

2. The hybrid assist system (100) for the vehicle as claimed in claim 1, wherein the one or more switches comprises a first switch (104a) and a second switch (104b), wherein the first battery assembly (106) being electrically coupled to the controller (104) through the first switch (104a), and second battery assembly (108) being electrically coupled to the controller (104) through the second switch (104b).

3. The hybrid assist system (100) for the vehicle as claimed in claim 1, wherein controlling the operating mode comprises enabling discharging of the first battery assembly (106) by closing the first switch (104a) and opening the second switch (104b), during an engine cranking condition, or the vehicle being in a hybrid assist mode.

4. The hybrid assist system (100) for the vehicle as claimed in claim 1, wherein controlling the operating mode comprises enabling direct charging of at least one of the first battery assembly (106) and second battery assembly (108) by closing the first switch (104a) and the second switch (104b) during vehicle running condition.

5. The hybrid assist system (100) for the vehicle as claimed in claim 1, wherein controlling the operating mode comprises closing the first switch (104a) and opening the second switch (104b) to enable charging of the first battery assembly (106) during application of a regenerative mode in the vehicle.

6. The hybrid assist system (100) for the vehicle as claimed in claim 1 wherein the vehicle includes a vehicle propelling machine (102), the vehicle propelling machine (102) being operably connected to the controller (104), wherein the first battery assembly (106) being configured to discharge power to the vehicle propelling machine (102) through the controller (104) and the second battery assembly (108) being configured to power the one or more vehicle electrical loads (110).

7. The hybrid assist system (100) for the vehicle as claimed in claim 1, wherein the vehicle propelling machine (102) being an integrated stater generator.

8. The hybrid assist system (100) for the vehicle as claimed in claim 4, wherein the vehicle running condition being when the vehicle is in the running condition at a predefined speed, wherein the predefined speed being more than or equal to 5 Kmph.

9. The hybrid assist system (100) for the vehicle as claimed in claim 1, wherein the controller (104) disconnects the first battery assembly (106) and the second battery assembly (108) by opening the first switch (104a) and the second switch (104b) during in vehicle sleep mode, wherein the vehicle sleep mode comprises at least one of the ignition OFF condition and the vehicle being inoperative for more than a pre-defined time.

10. The hybrid assist system (100) for the vehicle as claimed in claim 11, wherein the pre-defined time (T1) being equal to or more than 15 minutes.

11. The hybrid assist system (100) for the vehicle as claimed in claim 1, wherein the first battery assembly (106) and the second battery assembly (108) being an equal capacity battery.

12. The hybrid assist system (100) for the vehicle as claimed in claim 1, wherein the controller (104) determines the operating condition of the vehicle based on inputs from a plurality of sensors of the vehicle.

13. A method for providing a hybrid assist to a vehicle, the method comprising steps of:
receiving, by a controller (104) an ignition status of the vehicle;
determining, by the controller (104), an operating condition of the vehicle based on inputs from a plurality of sensors; and
controlling, by the controller (104), an operating mode associated with a first battery assembly (106) and a second battery assembly (108) based on an operating condition of the vehicle, wherein the operating mode is one of a charging mode and a discharging mode of the first battery assembly (106) and the second battery assembly (108),
wherein controlling comprises selectively toggling one or more switches based on the operating condition of the vehicle to enable at least one of selective direct charging or selective direct discharging of at least one of the first battery assembly (106) and second battery assembly (108).

14. The method as claimed in claim 13, wherein the one or more switches includes a first switch (104a) and a second switch (104b), wherein the first switch (104a) and the second switch (104b) electrically couple the first battery assembly (106) and the second battery assembly (108) to the controller (104).

15. The method as claimed in claim 13, wherein controlling comprises enabling discharging of the first battery assembly (106), by the controller (104), by closing the first switch (104a) and opening a second switch (104b), during an engine cranking condition, or the vehicle being in a hybrid assist mode.

16. The method as claimed in claim 13, wherein the controlling comprises enabling, by the controller (104), direct charging of at least one of the first battery assembly (106) and second battery assembly (108) by closing the first switch (104a) and the second switch (104b) during a vehicle running condition.

17. The method as claimed in claim 13, wherein the controlling comprises closing the first switch (104a) and opening the second switch (104b) to enable charging of the first battery assembly (106) during a regenerative mode in the vehicle.

18. The method as claimed in claim 13, wherein the vehicle includes a vehicle propelling machine (102), the vehicle propelling machine (102) being operably connected to the controller (104), wherein the first battery assembly (106) being configured to discharge power to the vehicle propelling machine (102) through the controller (104) and the second battery assembly (108) being configured to power the one or more vehicle electrical loads (110).

19. The method as claimed in claim 13, wherein the vehicle propelling machine (102) being an integrated stater generator.

20. The method as claimed in claim 13, wherein the controller (104) disconnects the first battery assembly (106) and the second battery assembly (108) by opening the first switch (104a) and the second switch (104b) during in a vehicle sleep mode, wherein the vehicle sleep mode comprises at least one of the ignition OFF condition and the vehicle being inoperative for more than a pre-defined time(T1), wherein the pre-defined time (T1) being equal to or more than 15 minutes..

21. The method as claimed in claim 13, wherein the first battery assembly (106) and the second battery assembly (108) being an equal capacity batteries.

22. The method as claimed in claim 13, wherein the vehicle running condition is when the vehicle is in the running condition at a predefined speed, wherein the predefined speed is more than 5 Kmph.