FIELD OF INVENTION

[0001] The present invention relates to an electric vehicle, and more particularly to operating mode selection mechanism of the electric vehicle.

BACKGROUND

5 [0002] With the increasingly serious environmental pollution issues from motor vehicles and scarcity of oil resources, electrical vehicles (EV’s) which are highly efficient, energy-saving, and environmentally friendly have been developed. The electrical vehicle comprises an electric motor which is driven by electric energy stored in a power source such as a battery. As the battery has a limited storage capacity, the0 electric motor is operated in an economy mode which gives priority to travelling distance, and when driving torque is needed, the electric motor is operated in a power mode which gives priority to power performance of the electric motor.

[0003] The electrical vehicle comprises a mode selection switch for selecting between the economy mode and the power mode. A rider riding the electric vehicle 5 selects the economy mode while traveling on a flat road at a constant speed and selects the power mode when extra power is needed, e.g. to accelerate or climb a hill. However, during operation of the electric vehicle, the rider switches to a power mode when climbing a hill or when he needs to accelerate or overtake, and after completion of the extra power requirement, the rider of the vehicle has to operate the mode0 selection switch to switch back to economy mode, if in case he forgets to switch it back to economy mode the electric vehicle continues to operate in the power mode continuously which may lead to decreased service life of the electric motor and may cause motor torque fluctuations, which is undesirable. Further, using the mode selection switch to toggle between economy mode and power mode may impose5 additional burden on the rider.

SUMMARY OF INVENTION

[0004] This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

[0005] In one aspect of the present invention, an electric vehicle system for an electric vehicle is provided. The electric vehicle system for an electric vehicle comprising a motor driver unit, an electric motor, a battery, at-least a wheel, a handle bar, a rotating handle grip system, and an electronic control unit. Electric vehicle system for the electric vehicle comprising the electric motor for providing drive torque to the at least one wheel of the electric vehicle. The electric vehicle system for the electric vehicle also comprising a motor drive unit to control operation of the electric motor. Further, the electric vehicle system for the electric vehicle comprising a battery electrically coupled to the electric motor and providing energy to the electric motor. Furtheralso, the electric vehicle system for the electric vehicle comprising the electronic control unit and a rotating handle grip system, the electronic control unit electronically coupled to the rotating handle grip system, the rotating handle grip system comprises a LH rotating handle grip system mounted to the left side of a handle bar of the electric vehicle, and a RH rotating handle grip system mounted to the right side of the handle bar of the electric vehicle. The LH rotating handle grip system comprises a control unit and a rotating cylindrical member rotatably mounted to the handle bar, the rotating cylindrical member adapted to be engaged in a plurality of operating modes. The plurality of operating modes comprising at least one fixed operating mode, wherein the rotating cylindrical member remains in the same position when the rotating cylindrical member is released by user. The plurality of operating modes comprising at least one temporary operating mode, wherein the rotating cylindrical member automatically returns back to the at least one fixed operating mode when the rotating cylindrical member is released by users. Each operating mode of the plurality of operating modes is sensed by the control unit. Each operating mode of the plurality of operating modes corresponds to different operating condition of the electric vehicle, and wherein the electronic control unit receives input from the control unit and controls electrical energy supplied by the battery to the electric motor as per the requirement of the corresponding operating condition.

[0006] In an embodiment, the plurality of operating modes of the electric vehicle system for the electric vehicle include two fixed operating modes and the at least one temporary mode. [0007] In an embodiment, the plurality of operating modes of the electric vehicle system for the electric vehicle include two temporary operating modes.

[0008] In an embodiment, the first operating mode of the electric vehicle system for the electric vehicle is a reverse mode, the second operating mode is an economy mode, the third operating mode is a sport mode, and the fourth operating mode is a boost mode.

[0009] In an embodiment, in the electric vehicle system for the electric vehicle, one temporary operating mode of the at least one temporary operating mode is disposed at one extreme end of the plurality of operating modes.

[0010] In an embodiment, the mode selection grip of the electric vehicle system for the electric vehicle is fixedly coupled with the rotating cylindrical member.

[0011] In an embodiment, the LH rotating handle grip system of the electric vehicle system for the electric vehicle comprises an operating mode selection mechanism. The operating mode selection mechanism comprising a rotating cylindrical member comprises a cylindrical flange portion. The cylindrical flange portion comprises at least one slot having a lower surface. The at least one slot comprises a ball member and a biasing member. The biasing member is disposed between the lower surface and the ball member. A magnet is fixedly disposed on the cylindrical flange portion and a control unit is fixedly mounted on the handle bar and electronically communicating with the electronic control unit. The control unit comprises an outer casing and an inner member. The inner member comprises at least one temporary curved profile portion and at least one fixed click profile portion, a printed circuit board assembly, and a detector configured to detect rotation angle of the mode selection grip. When the ball member engages with the at least one fixed click profile portion, the ball member remains in the same position when the rotating cylindrical member is released by rider. When the ball member engages with the at least one temporary curved profile portion, the ball member automatically returns back to the at least one fixed click profile portion when the rotating cylindrical member is released by rider.

[0012] In an embodiment, the at least one temporary curved profile portion includes at least one first curved profile portion and at least one second curved profile portion.

[0013] In an embodiment, the at least one fixed click profile portion includes at least one first click profile portion and at least one second click profile portion. [0014] In an embodiment, the electronic control unit controls electrical energy supplied by the battery to the electric motor basis the detected mode by the control unit from among the plurality of operating modes.

[0015] In another aspect of the invention, an electric vehicle is provided. The electric vehicle comprises at-least a wheel, a handle bar, an electronic control unit electronically coupled to the rotating handle grip system and an electric vehicle system. The electric vehicle system comprising a motor drive unit, an electric motor for providing drive torque to the at least one wheel, a battery electrically coupled and providing energy to the electric motor, a battery management system configured to monitor and control the battery, a rotating handle grip system. The rotating handle grip system comprises a LH rotating handle grip system mounted to the left side of a handle bar of the electric vehicle and a RH rotating handle grip system mounted to the right side of the handle bar of the electric vehicle. The LH rotating handle grip system comprises an operating mode selection mechanism. The operating mode selection mechanism comprising a rotating cylindrical member rotatably mounted on the handle bar. The rotating cylindrical member facilitates selecting an operating mode from among the plurality of operating modes such as a second operating mode, a third operating mode, and a fourth operating mode, wherein each mode corresponds to different operating conditions of the electric vehicle. The rotating cylindrical member comprises a cylindrical flange portion. The cylindrical flange portion comprises at least one slot having a lower surface. The at least one slot comprises a ball member and a biasing member. The biasing member is disposed between the lower surface and the ball member. The magnet is fixedly disposed on the cylindrical flange portion. The control unit fixedly mounted on the handle bar and electronically communicating with the electronic control unit. The control unit comprises an outer casing and an inner member disposed coaxially within the outer casing. The inner member comprises at least one first curved profile portions, at least one first click profile portions, at least one second click profile portions, a printed circuit board assembly and a detector configured to detect rotation angle of the mode selection grip. When the ball member engages with the at least one first click profile portions, the ball member remains in the at least one first click profile portion when the rotating cylindrical member is released by user and the electronic control unit receives the input from the control unit and controls electrical energy supplied by the battery to the electric motor as per the second operating mode. When the ball member engages with the at least one second click profile portions, the ball member remains in the at least one second click profile portion when the rotating cylindrical member is released by user, and the electronic control unit receives the input from the control unit and controls electrical energy supplied by the battery to the electric motor as per the third operating mode. When the ball member engages with the at least one first curved profile portion, the ball member automatically returns back to the at least one first click profile portion when the rotating cylindrical member is released by user and the electronic control unit receives the input from the control unit and controls electrical energy supplied by the battery to the electric motor as per the first operating mode.

[0016] In an embodiment, the inner member further comprises at least one second curved profile portions, wherein when the ball member engages with the at least one second curved profile portions, the ball member automatically returns back to the at least one second click profile portion when the rotating cylindrical member is released by user and the electronic control unit receives the input from the control unit and controls electrical energy supplied by the battery to the electric motor as per the fourth operating mode.

[0017] In an embodiment, the electronic control unit controls based on the value from the sensor and on the detected value of the detector.

[0018] In accordance with the resent invention, the rotating cylindrical member automatically returns to fixed operating mode positions such as second operating mode, and the third operating mode, thereby reducing the burden on the rider to toggle between different operating modes.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The invention itself, together with further features and attended advantages, will become apparent from consideration of the following detailed description, taken in conjunction with the accompanying drawings. One or more embodiments of the present invention are now described, by way of example only wherein like reference numerals represent like elements and in which:

[0020] Figure 1 illustrates a view of an exemplary electric two-wheeled vehicle in accordance with an embodiment of the present invention;

[0021] Figure 2 is a block diagram of an electrical two-wheeled vehicle system, according to an embodiment of the present invention; [0022] Figure 3 is a view of a LH rotating handle grip system of the electric two wheeled vehicle system, according to an embodiment of the invention;

[0023] Figure 4 is a sectional view of the LH rotating handle grip system along the line B-B’ of the Figure 3, according to an embodiment of the present invention; and

[0024] Figure 5 is a sectional view of the LH rotating handle grip system along the line A-A’ of the Figure 3, according to an embodiment of the present invention.

[0025] The drawings referred to in this description are not to be understood as being drawn to scale except if specifically noted, and such drawings are only exemplary in nature.

DETAILED DESCRIPTION

[0026] While the invention is susceptible to various modifications and alternative forms, an embodiment thereof has been shown by way of example in the drawings and will be described here below. It should be understood, however that it is not intended to limit the invention to the particular forms disclosed, but on the contrary, the invention is to cover all modifications, equivalents, and alternative falling within the spirit and the scope of the invention.

[0027] The term“comprises”, comprising, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, structure or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or structure or method. In other words, one or more elements in a system or apparatus proceeded by“comprises... a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus.

[0028] For better understanding of this invention, reference would now be made to the embodiment illustrated in the accompanying Figures and description here below, further, in the following Figures, the same reference numerals are used to identify the same components in various views.

[0029] While the present invention is illustrated in the context of an electric vehicle, however, operating mode selection mechanism and aspects and features thereof can be used with other type of vehicles as well. The terms“vehicle”,“two wheeled vehicle”, “motorcycle” and “scooter” have been interchangeably used throughout the description. The term “vehicle” comprises vehicles such as motorcycles, scooters, bicycles, mopeds, scooter type vehicle, all-terrain vehicles (ATV) and the like.

[0030] The terms“front / forward”,“rear / rearward / back / backward”,“up / upper / top”,“down / lower / lower ward / downward, bottom”,“left / leftward”,“right / rightward” used therein represents the directions as seen from a vehicle driver sitting astride and these directions are referred by arrows Fr, Rr, U, Lr, L, R in the drawing Figures.

[0031] Figure 1 illustrates a view of an exemplary electric two-wheeled vehicle (150) in accordance with an embodiment of the present invention. The vehicle (150) referred to herein, embodies a scooter, more specifically an electric scooter. Alternatively, the vehicle (150) may embody any other ridden vehicles such as motorcycle, step-through, moped, three-wheeled vehicle, all-terrain vehicles (ATV) etc. without limiting the scope of the invention. The two-wheeled vehicle (150) comprises, inter-alia, a front ground engaging member or a wheel (114), a front fender (153), a front cover (152), a handle bar (101), a mirror assembly (154L, 154R), a frame body (not shown), a storage compartment (not shown), a footboard (158f), a pair of side cover (159L, 159R) disposed to cover left and right sides of the frame body, a seat (156), a headlamp assembly (158), a display meter (157), a rear ground engaging member (not shown), and a tail light assembly (155). The frame body supports the handle bar (101) and the front ground engaging member (114) in front portion of the electric vehicle (150). The handle bar (101) is pivotally mounted on the frame body. The front ground engaging member (114) is operatively connected to the handle bar (101). The handle bar (l0l) is configured to be rotated by the rider to steer the electric vehicle (150). It may be noted that the electric vehicle (150) is shown to have include above stated parts, however, those skilled in the art would appreciate that the vehicle includes other parts which may not be relevant for explaining the present invention and hence are not shown and described. A power unit (not shown) is provided to provide necessary power required to drive the rear ground engaging member of the electric vehicle (150). Alternatively, the power unit may provide necessary power to the drive the front ground engaging member (114), or both the front ground engaging member (114) and the rear ground engaging member simultaneously, without limiting the scope of the disclosure. [0032] Referring to Figure 2, an electric two-wheeled vehicle system (100) associated with the electric vehicle (150), according to an embodiment of the present invention is depicted. The electric vehicle system (100) comprises a rotating handle grip system (102). The rotating handle grip system (102) comprises a LH rotating handle grip system (102L) mounted to the left side of a handle bar (101) of the electric vehicle (150), and a RH rotating handle grip system (102R) mounted to the right side of the handle bar (101) of the electric vehicle (150). Further, the electric vehicle system (100) comprises a battery management system (104), a battery (106), an electronic control unit (108), a motor drive unit (110), an electric motor (112), a wheel (114), and a speedometer unit (116). Additionally, the electric vehicle system (100) may comprises additional components generally associated with traditional electric vehicles without limiting the scope of the invention.

[0033] The rotating handle grip system (102) is electronically coupled to the electronic control unit (108). The electronic control unit (108) controls various operations within the electric vehicle system (100). The electronic control unit (108) is electronically coupled to the battery management system (104). The battery management system (104) is electronically coupled to the battery (106). In present embodiment, the LH rotating handle grip system (102L) is electronically coupled to the electronic control unit (108). However, in another embodiment, the RH rotating handle grip system (102R) may be electronically coupled to the electronic control unit (108).

[0034] The battery management system (104) comprises a controller (not shown) and a battery monitor (not shown). The battery monitor is a sensor or a circuit element that monitors the state of the battery (106). Specifically, the battery monitor comprises for example, a temperature sensor (not shown) that detects the temperature of the battery (106), a voltmeter (not shown) that detects the output voltage of the battery (106), an ammeter (not shown) that detects a current outputted from the battery (106), and a current (not shown) supplied to the battery (106). A signal (not shown) from the battery monitor is then inputted to the controller. The controller monitors the state of the battery (106), based on a signal of the battery monitor. The controller communicates with the electronic control unit (108), to notify the electronic control unit (108) of the state of the battery (106) (for example, the remaining battery power or abnormality). In the illustrated example, the battery (106) is a Li-ion battery. Alternatively, the battery (106) may be lead-acid battery without any limitations. [0035] The battery (106) is electronically coupled to the motor drive unit (110). The electronic control unit (108) and the motor drive unit (110) are electronically coupled to each other. For example, the electronic control unit (108) and the motor drive unit (110) provide bilateral communication according to a network standard such as controller area network (CAN) or the like. The motor drive unit (110) receives electric power from the battery (106), and converts the electric power from the battery (106) into a driving electric power of the electric motor (112), and supplies the driving electric power to the electric motor (112). The motor drive unit (110) comprises an inverter (not shown) and the controller unit (not shown). For example, the motor drive unit (110) converts a DC from the battery (106) into an AC and supplies the AC to the electric motor (112). In the illustrated example, the electric motor (112) is a three phase AC motor. Alternatively, the electric motor (112) may be a DC motor or any other motor known in the art, without any limitations.

[0036] The electric motor (112) is operatively coupled to the at least one wheel. In the exemplary embodiment, the electric motor (112) is operatively coupled to the wheel (114). The electric motor (112) drives the wheel (114) to drive the electric vehicle. The speedometer unit (116) is electronically coupled to the wheel (114), the motor drive unit (110), and the electronic control unit (108). The speedometer unit (116) displays the information such as vehicle speed, the remaining battery charge of the battery (106) or the like. In an example, the speedometer unit (116) is supported on a handle bar (101). In an embodiment, the speedometer unit (116) also displays information regarding the current selected mode of the plurality of operating modes (M) of the LH rotating handle grip system (102L).

[0037] The RH rotating handle grip system (102R) is supported on right side of the handle bar (101). The RH rotating handle grip system (102R) is electronically coupled to the electronic control unit (108). The RH rotating handle grip system (102R) comprises an acceleration grip (similar to 132 shown in Figure 4). An outer peripheral surface (similar to 120 shown in Figure 4) of the acceleration grip provides a grip portion which can be gripped by a rider. The electronic control unit (108) detects rotation of the acceleration grip via a sensor (not shown). More particularly, the sensor generates a value based on the rotation of the acceleration grip, which is then communicated to the electronic control unit (108). The electronic control unit (108) controls the electrical energy supplied by the battery (106). The electric motor (112) is drivably coupled to the wheel (114). [0038] Referring to Figure 3 and 4, the LH rotating handle grip system (102L) is supported on the left side of the handle bar (101) (shown in Figure 2). The LH rotating handle grip system (102L) is electronically coupled to the electronic control unit (108) (shown in Figure 1). The LH rotating handle grip system (102L) comprises a control unit (122) and a rotating cylindrical member (132) rotatably mounted to the handle bar (101), the rotating cylindrical member (132) adapted to be engaged in a plurality of operating modes (M), the plurality of operating modes (M)comprising at least one fixed operating mode (MF), wherein the rotating cylindrical member (132) remains in the same position when the rotating cylindrical member (132) is released by user at least one temporary operating mode (MT), wherein the rotating cylindrical member (132) automatically returns back to the at least one fixed operating mode (MF) when the rotating cylindrical member (132) is released by users and wherein each operating mode of the plurality of operating modes (M) is sensed by the control unit (122), wherein each operating mode the plurality of operating modes (M) corresponds to different operating condition of the electric vehicle (150), and wherein the electronic control unit (108) receives input from the control unit (122) and controls electrical energy supplied by the battery (106) to the electric motor (112) as per the requirement of the corresponding operating condition.

[0039] The LH rotating handle grip system (102L) comprises an operating mode selection mechanism (119). The operating mode selection mechanism (119) comprises a rotating cylindrical member (132), and a control unit (122). The rotating cylindrical member (132) is rotatably mounted on the handle bar (101). The rotating cylindrical member (132) is rotated relative to the handle bar (101) coaxially therewith. The rotating cylindrical member (132) comprises a cylindrical flange portion (134). A mode indicator (128) is disposed on the outer periphery of the cylindrical flange portion (134). The cylindrical flange portion (134) is rotatably disposed within the control unit (122). The cylindrical flange portion (134) comprises at least one slot (135) (shown in Figure 5) having a lower surface (l35a). In the illustrated example, the cylindrical flange portion (134) comprises two slots (135). Alternatively, the cylindrical flange portion (134) may comprise one or more than one slots (135) without limiting the scope of the invention. Moreover, in an embodiment, an outer peripheral surface of the rotating cylindrical member (132) provides a grip portion which may be gripped by the rider. [0040] The control unit (122) is fixedly coupled to the handle bar (101). The control unit (122) is electronically coupled to the electronic control unit (108). The control unit (122) comprises an outer casing (124). A plurality of mode indicators (130) are disposed on the outer periphery of the outer casing (124).

[0041] Further referring to Figure 3, the operating mode selection mechanism (119) comprises a mode selection grip (120). The mode selection grip (120) is fixedly coupled with the rotating cylindrical member (132). The mode selection grip (120) is rotatably mounted on the handle bar (101). The rotating cylindrical member (132) is disposed coaxial to the mode selection grip (120). The rotating cylindrical member (132) is rotated together with the mode selection grip (120). In present embodiment, an outer peripheral surface of the mode selection grip (120) provides a grip portion which may be gripped by the rider. The mode selection grip (120) comprises a flange portion (126). In shown embodiment, the mode indicator (128) is disposed on the outer periphery of the flange portion (126).

[0042] Further, the operating mode selection mechanism (119) comprises a magnet (140), at-least a ball member (136) and at-least a biasing member (138). The magnet (140) is disposed on the rotating cylindrical member (132). More particularly, the magnet (140) is disposed on the cylindrical flange portion (134) of the rotating cylindrical member (132). The magnet (140) rotates together with the mode selection grip (120).

[0043] The operating mode selection mechanism (119) comprises a ball member (136) and a biasing member (138) in each slot (135). In the illustrated example, the biasing member (138) embodies a coil spring. Alternatively, the biasing member (138) may be any kind of spring member know in the art, without limitations. In the illustrated example, the biasing member (138) is disposed between the ball member (136) and a lower surface (135a) of the slot (135). The biasing member (138) is configured to retract and expand within the slot (135). In the illustrated example, the ball member (136) is made of steel. Alternatively, the ball member (136) may be made from any material without limiting the scope of the invention.

[0044] Referring further to Figure 4, the control unit (122) comprises an inner member (141), a detector (142), and aprinted circuit board assembly (144) (hereinafter alternatively referred to as PCB assembly (144)). The inner member (141) is disposed coaxially within the outer casing (124). The PCB assembly (144) is fixedly coupled to the inner member (141). The detector (142) is disposed on the PCB assembly (144). The detector (142) is a contact less detector configured to detect variations in a magnetic field of the magnet (140). The detector (142) detects a rotation angle of the mode selection grip (120). Based on a detected value of the detector (142), the control unit (122) communicates the detected value to the electronic control unit (108). The electronic control unit (108) controls the electrical energy supplied by the battery (106) to the electric motor (112) based on the value from the sensor and on the detected value of the detector (142). Alternatively, the detector (142) is a contact type detector, such as a potentiometer.

[0045] The rotating cylindrical member (132) of the electric vehicle system (100) of an electric vehicle (150) adapted to be engaged in a plurality of operating modes (M), the plurality of operating modes (M) comprising at least one fixed operating mode (MF), wherein the rotating cylindrical member (132) remains in the same position when the rotating cylindrical member (132) is released by user and at least one temporary operating mode (MT), wherein the rotating cylindrical member (132) automatically returns back, to the at least one fixed operating mode (MF) when the rotating cylindrical member (132) is released by users, and wherein each operating mode of the plurality of operating modes (M) is sensed by the control unit (122), wherein each operating mode the plurality of operating modes (M) corresponds to different operating condition of the electric vehicle (150), and wherein the electronic control unit (108) receives input from the control unit (122) and controls electrical energy supplied by the battery (106) to the electric motor (112) as per the requirement of the corresponding operating condition.

[0046] As illustrated in Figure 5, the LH rotating handle grip system (102L) comprises a plurality of operating modes (Ml, M2, M3, M4). The plurality of operating modes comprises at least one fixed operating mode (MF). The exemplary embodiment, illustrates two fixed operating modes (M2 or M3). Alternatively, the plurality of operating modes comprises at least one fixed operating mode (M2 or M3). The plurality of operating modes comprises at least one temporary operating mode (MT). The exemplary embodiment, illustrates two temporary operating modes (Ml or M4). One temporary operating mode of the at least one temporary operating mode (MT) is disposed at one extreme end of the plurality of operating modes (M). As shown in Figure 3 and Figure 5, one of the temporary modes (Ml) is disposed at one extreme end and the other temporary operating mode (M4) is disposed at other extreme end among the plurality of operating modes (M). Further, number of slots (135) depend as per the requirement and design of the LH rotating handle grip system (102L).

[0047] The inner member (141) comprises at least one temporary curved profde portion (C) and at least one fixed click profde portion (A). When the ball member (136) engages with the at least one fixed click profde portion (A), the ball member (136) remains in the same position when the rotating cylindrical member (132) is released by rider and when the ball member (136) engages with the at least one temporary curved profde portion (C), the ball member (136) automatically returns back to the at least one fixed click profde portion (A) when the rotating cylindrical member (132) is released by rider.

[0048] Referring further to Figure 5, in the exemplary embodiment, the at least one temporary curved profde portion (C) comprises at-least one first curved profde portions (Cl) and at-least one second curved profde portions (C2). And the at least one fixed click profde portion (A) comprises at-least one first click profde portion (Al) and at-least one second click profde portion (A2). In the illustrated example, the inner member (141) comprises two first curved profde portions (Cl) disposed diagonally opposite to one another, two first click profde portions (Al) disposed diagonally opposite to one another, two second click profde portions (A2) disposed diagonally opposite to one another, and two second curved profde portions (C2) disposed diagonally opposite to one another. The at least one first curved profde portion (Cl), and the at least one second curved profde portion (C2) enable the temporary operating modes (MT) such as the first operating mode (Ml) and the fourth operating mode (M4). The at least one first click profde portion (Al) and the at least one second click profde portion (A2) enable the fixed operating modes (MF) such as second operating mode (M2) and the third operating mode (M3). In an embodiment, the at least one first curved profde portion (Cl), and the at least one second curved profde portion (C2) may have similar profde. In an embodiment, the at least one first click profde portion (Al) and the at least one second click profde portion (A2) may have similar profde.

[0049] The ball member (136) always remain in contact with the inner periphery of the inner member (141) under the influence of biasing force of the biasing member (138). The ball member (136) is configured to engage with the at least one first curved profde portion (Cl), the at least one first click profde portion (Al), the at least one second click profde portion (A2), and the at least one second curved profde portions (C2) of the inner member (141), when the mode selection grip (120) is rotated by the rider.

[0050] Referring to Figure 4, in an embodiment, the rotating cylindrical member (132) is rotated by the rider. Further, in an embodiment, the mode selection grip (120) may be rotated by the rider. As the rotating cylindrical member (132) is disposed coaxial to the mode selection grip (120). The rotating cylindrical member (132) is rotated together with the mode selection grip (120).

[0051] Referring to Figures 3, 4 and 5, during operation, when the rotating cylindrical member (132) is rotated (anticlockwise in the Figure 5) to shift the operating mode of the electric vehicle (150) to the first operating mode (Ml) from the second operating mode (M2), by the rider, the ball member (136) moves along the first curved profile portion (Cl), and moves inside the slot (135) towards the lower surface (135a) of the slot (135) compressing the biasing member (138). During this rotation, the magnet (140) changes its position, as magnet moves with the rotating cylindrical member (132). The detector (142) detects the rotation angle of the rotating cylindrical member (132) and communicates the detected value to the electronic control unit (108). Based on the detected value of the detector (142), the electronic control unit (108) controls the electrical energy supplied by the battery (106) to the electric motor (112) coupled to the wheel (114). For the first operating mode (Ml) rider has to constantly keep the force applied on the mode selection grip (120). In the illustrated example, the first operating mode (Ml) is a reverse mode that means in the first operating mode (Ml), the electric motor (112) rotates the wheel (114) of the vehicle (150) in reverse direction, this mode is helpful for parking of the vehicle (150). As soon as the rider releases the rotating cylindrical member (132), the biasing member (138) pushes the ball member (136) upwards away from the lower surface (135a) of the slot (135), while rotating the rotating cylindrical member (132) (in the clockwise direction in the Figure 5) back to the second operating mode (M2) which is a fixed operating mode (MF). Since the rotating cylindrical member (132) automatically returns back from the first operating mode (Ml). Hence, the first operating mode (Ml) is called as the temporary operating mode (MF).

[0052] When the rotating cylindrical member (132) is rotated (anticlockwise in the Figure 5) to the second operating mode (M2) from the third operating mode (M3), by the rider, each ball member (136) is already engaged in the second click profile portion (A2). When force is applied by the rider to the rotating cylindrical member (132), each ball member (136) initially moves along a second slanting portion (S2) of the second click profile portion (A2) and moves inside the slot (135) towards the lower surface (l35a) of the slot (135) compressing the biasing member (138). When the ball member (136) reaches an extreme point (E), the ball member (136) is pushed out away from the lower surface (l35a) of the slot (135) under the influence of biasing force of the biasing member (138) and moves along a first slanting portion (Sl) of the first click profile portion (Al), till the ball member (136) reaches a first deep point (Dl) of the first click profile portion (Al). Thereafter, the ball member (136) remains engaged at the first deep point (Dl) unless external force is applied by the rider on the rotating cylindrical member (132). During this rotation the magnet (140) changes its position, the detector (142) detects the rotation angle of the rotating cylindrical member (132) and communicates the detected value to the electronic control unit (108). Based on the value from the sensor, and the detected value of the detector (142), the electronic control unit (108) controls the electrical energy supplied by the battery (106) to the electric motor (112) coupled to the wheel (114). In the illustrated example, the second operating mode (M2) is an economy mode. In the second operating mode (M2) even if user releases the rotating cylindrical member (132), it remains in the same position, hence it is called as the fixed operating mode (M2).

[0053] When the rotating cylindrical member (132) is rotated (clockwise in the Figure 5) to shift the operating mode of the electric vehicle (150) to the third operating mode (M3) from the second operating mode (M2), by the rider, each ball member (136) is already engaged in the first click profile portion (Al). When force is applied to the rotating cylindrical member (132) by the rider, each ball member (136) initially moves along the first slanting portion (Sl) of the first click profile portion (Al) and moves inside the slot (135) towards the lower surface (l35a) of the slot (135) while compressing the biasing member (138). When the ball member (136) reaches the extreme point (E), the ball member (136) is pushed out away from the lower surface (l35a) of the slot (135) under the influence of biasing force of the biasing member (138) and it moves along the second slanting portion (S2) of the second click profile portion (A2) till the ball member (136) reaches the second first deep point (D2) of the second click profile portion (A2). Thereafter, the ball member (136) remains engaged at this point unless external force is applied by the rider on the rotating cylindrical member (132). During this rotation the magnet (140) changes its position, the detector (142) detects the rotation angle of the rotating cylindrical member (132), and communicates the detected value to the electronic control unit (108). Based on the detected value of the detector (142), the electronic control unit (108) controls the electrical energy supplied by the battery (106) to the electric motor (112) coupled to the wheel (114). In the illustrated example, the third operating mode (M3) is a sport mode. In the third operating mode (M3) even if user releases the rotating cylindrical member (132), it remains in the same position, hence it is called as the fixed operating mode (MF).

[0054] When the rotating cylindrical member (132) is rotated to shift the operating mode of the electric vehicle (150) (clockwise in the Figure 5) to the fourth operating mode (M4) from the third operating mode (M3), by the rider, each ball member (136) moves along the second curved profde portion (C2) and moves inside the slot (135) towards the lower surface (l35a) of the slot (135) compressing the biasing member (138). During this rotation the magnet (140) changes its position. The detector (142) detects the rotation angle of the rotating cylindrical member (132), and communicates the detected value to the electronic control unit (108). Based on the value from the detector (142), the electronic control unit (108) controls the electrical energy supplied by the battery (106) to the electric motor (112) coupled to the wheel (114). For the fourth operating mode (M4) rider has to constantly keep the force applied on the rotating cylindrical member (132). In the illustrated example, the fourth operating mode (M4) is a boost mode (or power mode). As soon as rider releases the mode selection grip (120), the biasing member (138) pushes the ball member (136) upwards away from the lower surface (l35a) of the slot (135) rotating the mode selection grip (120) (in the anticlockwise direction in the Figure 5), back to the third operating mode (M3) which is a fixed operating mode. Since, the rotating cylindrical member (132) automatically returns back from the fourth operating mode (M4), it is called as the temporary operating mode (MT).

[0055] In the present invention a method of enabling the operating mode selection mechanism (119) of the electric vehicle system (100) for the electric vehicle (150). The method comprises following steps. Firstly, mounting the rotating cylindrical member (132) rotatably on the handle bar (101). Secondly, facilitating selection of different operating modes of operation such as the second operating mode (M2), the third operating mode (M3), and the fourth operating mode (M4) through the rotating cylindrical member (132). Thirdly, the control unit (122) is fixed to the handle bar (101). Fourthly, placing the ball member (136) and the biasing member (138) in each slot (135) of the plurality of slots (135). Fifthly, coupling the ball member (136) operatively with the rotating cylindrical member (132). Sixthly, rotating the magnet (140) disposed on the rotating cylindrical member (132) together with the rotating cylindrical member (132). Seventhly, configuring the detector (142) to detect rotation angle of the rotating cylindrical member (132). Eighthly, either sliding the ball member (136) along the first curved profile portion (Cl) of the inner member (141) of the control unit (122), and engaging the ball member (136) along the first click profile portion (Al) of the inner member (141) of the control unit (122), when the rotating cylindrical member (132) goes back from the first operating mode (Ml) to the second operating mode (M2), as rider releases the rotating cylindrical member (132). Or else, sliding the ball member (136) along the second curved profile portions (C2) of the inner member (141) of the control unit (122), and engaging the ball member (136) along the second click profile portion (A2) of the inner member (141) of the control unit (122), when the rotating cylindrical member (132) goes back from the fourth operating mode (M4) to the third operating mode (M3), as rider releases the rotating cylindrical member (132). Ninthly, coupling the rotating handle grip system (102) electronically to the electronic control unit (108). Finally, controlling electrical energy supplied by the battery (106) to the electric motor (112) coupled to the wheel (114) by the electronic control unit (108).

[0056] In the illustrated example, the first operating mode (Ml) (reverse mode) is a momentary mode position i.e. when the rider releases the mode selection grip (120) from the first operating mode (Ml) the mode selection grip (120) goes back (auto returns) to the second operating mode (M2). The second operating mode (M2) (economy mode) is a fixed mode position i.e. until the rider further rotates the mode selection grip (120), the mode selection grip (120) remains in the second operating mode (M2). The third operating mode (M3) (sport mode) is a fixed mode position i.e. until the rider further rotates the mode selection grip (120), the mode selection grip (120) remains in the third operating mode (M3). The fourth operating mode (M4) (boost mode) is a momentary mode position i.e. when the rider releases the mode selection grip (120) from the fourth operating mode (M4) the mode selection grip (120) goes back (auto returns) to stable the third operating mode (M3).

[0057] The present invention relates to the electric vehicle system (100) associated with electric vehicle. The electric vehicle system (100) comprises the rotating handle grip system (102) having mode selection grip (120) facilitates in selecting different operating modes of operation such as a first operating mode (Ml), a second operating mode (M2), a third operating mode (M3), and a fourth operating mode (M4), wherein each of the modes corresponds to different operating conditions based on the load requirements of the electric vehicle system (100). Further, as the first operating mode (Ml) and the fourth operating mode (M4) are momentary mode positions wherein when the rider rotates and releases the mode selection grip (120), the mode selection grip (120) or the rotating cylindrical member (132) automatically returns to fixed mode positions such as second operating mode (M2) and the third operating mode (M3), thereby reducing the burden on the rider to toggle between economy mode and power mode.

[0058] Further, the present invention ensures that the service life of the electric motor (112) remains good, thereby avoiding motor torque fluctuations. Also, the present invention maintains the optimal usage of the electric energy stored in the power source such as the battery (106).

[0059] While few embodiments of the present invention have been described above, it is to be understood that the invention is not limited to the above embodiments and modifications may be appropriately made thereto within the spirit and scope of the invention.

[0060] While considerable emphasis has been placed herein on the particular features of this invention, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiments without departing from the principles of the invention. These and other modifications in the nature of the invention or the preferred embodiments will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.