FIELD OF INVENTION:
The present invention relates to an electronic security system for electric bikes  more particularly  the present invention relates to a transponder based security system with integrated immobilizer for electric bikes.
BACKGROUND OF THE INVENTION:
It has been found that health conditions and environmental awareness have prompted many people in the world to turn to alternative forms of transportation means other than liquid fuel based transport means such as Electric Bikes. People are using this type of transportation for so that they can keep away the harmful pollutants coming out from the conventional fuel resources. The increased popularity of the Electric Bikes has created a security problem for the owners of such vehicles.
The Electric Bike exists today comprises a battery (1)  an ignition cum handlebar lock (2)  E-Bike controller (3)  motor (4)  throttle (5) and brake (6) as shown in figure 1. The battery is the source of energy to drive the brush less DC motor which is embedded in the hub of the vehicle wheel. The E-Bike controller is the controlling device which converts the battery power to three phases PWM required to drive the motor. The speed of the vehicle depends on the position of the throttle.
The only security device available on the current vehicle is ignition cum handlebar lock (2) which has only few thousand combinations. Making a duplicate key is very easy and hence the chances of theft are very high. Generally  the mechanical lock has three positions LOCK  OFF and ON. At LOCK position the vehicle handle is locked means the handle could not be moved and hence the vehicle is not drivable. At OFF position the handle bar gets unlocked and hence could be towed but the E-Bike controller will not work and the motor will not move with the help of throttle. When it is at ON position the vehicle will be fully functional.
In order to increase the security  remote based systems are available in the market  which are retrofitted in the vehicle and are interfaced with the E-Bike controller with a coupler. Once the vehicle is installed with the remote and if any vibration occurs there  the security device gets activated and locks the motor for specified time so that the vehicle could not be moved. The main disadvantage of such system is that the coupler is easily accessible as these devices are mounted under the seat lock and it has few hundred combinations. So the thief could easily access this device  could remove the coupler and could take the vehicle. The second drawback of such system is that the remote operates with a small battery and if the battery gets discharged the remote will not function and hence the vehicle could not be started.
Another problem related to electric bikes is that major quantity of these bikes does not have any registration number  so once the bike has been stolen it could not be recognized easily even if the thief takes it away in front of owner and there is means to recover such bikes by police when there is no registration number marked on the bike number plate.
OBJECTIVES OF PRESENT INVENTION
The main object of the present invention is to provide an electronic security system for electric bikes.
Another main object of the present invention it to provide a transponder based security system with integrated immobilizer for electric bikes.
SUMMARY OF INVENTION:
The present invention relates to provide an electronic security system for electric bikes  more particularly  the present invention relates to provide a transponder based security system with integrated immobilizer for electric bikes. The electronic security system comprises voltage regulators (20)  throttle signal input (21)  brake signal input (22)  microcontroller (23)  motor driver output (24)  hall sensor inputs (25)  RF base station (26)  an antenna interface (27) and EEPROM (28). The present invention provides a security system for the electric bike controller with integrated immobilizer. The security system locks the wheels temporarily so that the vehicle can not be towed and hence the vehicle will be safe from any unauthorized access.
BRIEF DESCRIPTION OF THE DRAWINGS
Further aspects and advantages of the present invention will be readily understood from the following detailed description with reference to the accompanying figures.
The figures together with a detailed description below  are incorporated in and form part of the specification  and serve to further illustrate the embodiments and explain various principles and advantages  in accordance with the present invention wherein:
Figure 1: shows a block diagram of electric bike.
Figure 2: shows a block diagram of electric bike controller.
Figure 3: shows a block diagram of electric bike controller integrated with immobilizer according to an embodiment of the present invention.
Figure 4: shows a block diagram of electric bike with integrated immobilizer according to an embodiment of the present invention.
Skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and have not necessarily been drawn to scale. For example  the dimensions of some of the elements in the drawings may be exaggerated relative to other elements to help to improve understanding of embodiments of the present invention.
DESCRIPTION:
While the invention is susceptible to various modifications and alternative forms  specific embodiment thereof has been shown by way of example in the figures and will be described in detail 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 as defined by the appended claims.

Before describing in detail embodiments it may be observed that the novelty and inventive step that are in accordance with the present invention resides in transponder based security system with integrated immobilizer for electric bikes. It is to be noted that a person skilled in the art can be motivated from the present invention and modify the various component or the arrangements. However  such modification should be construed within the scope and spirit of the invention.

Accordingly  the drawings are showing only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.

The terms “comprises”  “comprising”  or any other variations thereof  are intended to cover a non-exclusive inclusion  such that a setup  device that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such setup or device. 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. The following paragraphs explain present invention wherein a transponder based security system with integrated immobilizer for electric bikes (as shown in figure 3). The invention in respect of the same may be deduced accordingly.

Accordingly  the present invention relates to provide a transponder based security system with integrated immobilizer for electric bikes. The transponder based security system comprises voltage regulators (20)  throttle signal input (21)  brake signal input (22)  microcontroller (23)  motor driver output (24)  hall sensor inputs (25)  RF base station (26)  an antenna interface (27) and EEPROM (28) as shown in figure 3.
Referring to figure 4  the ignition lock with antenna (33) is mounted on the electric bike. The antenna outputs are connected with the E-Bike controller (31). When the ignition lock with antenna (33) is put to ON position from the OFF position  the E-bike controller (31) gets power. Therefore  the microcontroller (23) enables the RF base station (26) which in response power up the ignition lock with antenna (33) through antenna interfaces (27). The ignition lock with antenna (33) operated with the help of a key. The key has an integrated transponder which has a unique ID. The key with integrated transponder is a passive device which has an antenna inside it and gets power from the antenna mounted on ignition cum steering lock. When the transponder in key gets power  the transponder transmits its ID by a modulation process. The modulated ID is received by the base station IC and the base station IC demodulated the same. The microcontroller (23) receives the ID in Manchester encoded form from the base station IC. The microcontroller (23) decodes the ID and matches the same with ID which is stored in the EEPROM (28). If the ID matches to the stored ID  the E-bike controller (31) drives the motor according to the signal received from the throttle (21). If the ID does not match to the stored ID  the E-bike controller (31) does not allow the motor to drive and even if someone tries to tow  the wheel will not move as the controller will locks the same temporarily.
When the ignition switch is put to ON position with a key with integrated transponder  the control unit gets energized. The microcontroller (23) enables the immobilizer circuit  which in response energizes the antenna which is mounted on the neck of the ignition lock. The antenna starts emitting magnetic field. As the transponder is in the vicinity of the magnetic field  the transponder gets energized. The microcontroller (23) sends a request to the transponder through antenna and in response to which the transponder transmits its ID. The ID of the original keys is stored in the memory on the control unit. The control unit checks the ID. If the ID matches with original ID stored in the memory  the E-Bike controller function gets activated and the vehicle can be use for driving. If the ID stored in the key is wrong  the vehicle gets locked. In such condition  the E-Bike controller function gets de-activated and also if someone tries to tow the vehicle  the E-bike controller locks the wheels temporarily so that the vehicle can not move.

ADVANTAGES OF THE PRESENT INVENTION
The advantage of the present invention over the prior art is that  in the present invention all the parts are integrated in single module. Therefore  it is not possible to by pass or disconnect the security system for stealing the vehicle.
The inventors have been working to develop the invention  so that advantage can be achieved in an economical  practical  and facile manner. While preferred aspects and example configurations have been shown and described  it is to be understood that various further modifications and additional configurations will be apparent to those skilled in the art. It is intended that the specific embodiments and configurations herein disclosed are illustrative of the preferred nature of the invention  and should not be interpreted as limitations on the scope of the invention.