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ELECTRIC BICYCLE WITH REGENERATIVE BRAKING SYSTEM
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 21, 2019 by SAE International in United States
Event: NuGen Summit
One of the significant challenges in the present scenario is the depletion of fossil fuels. As the use of conventional fuel is increasing day by day, it will lead to the complete depletion of fossil fuel in the future. So, an alternate solution to this problem is the use of electric vehicles which is independent of the dependence on fossil fuels. Electric vehicles (EVs) use batteries to power them and are electric motor driven. One advantage of using these electric vehicles is that they are pollution free and smokeless. One of the critical limitations of these electric vehicles is the low driving range per charge. The main proposal of this paper is the implementation of a regenerative braking system (RBS) which helps in recovering the kinetic energy that gets wasted during braking. RBS will be very useful in hilly terrain areas where much potential energy can get recovered while moving down the hill. This potential energy while going downhill is mostly wasted in brakes to regulate the speed of the vehicle. The present paper demonstrates the implementation of RBS on a simple bicycle converted to e-bike. This regenerative braking system improves the driving range of electric bicycle. An RBS system applies opposite torque on the motor which then works on a generative mode and converts kinetic energy into electrical energy which charges the batteries. For the implementation of this RBS system, we used two separate motors of 750 W and 250 W separately. A 750 W motor is used for driving the bicycle and a 250 W motor is used for the regenerative braking. A 750 W motor is mounted on the carrier of the rear wheel and connected through the rear driving wheel through a chain and sprocket system which makes the e-bike motor as well as pedal assisted. This motor is powered by four 12V batteries in series, connected through a controller. The speed throttle gives its input to the controller which modulates the current drawn from the batteries and supplies it to the motor. The 250 W motor is connected to a small wheel which is then connected to the front wheel. As the RBS mode is turned on the front wheel, the motor rotates opposite to the moving direction and generates a current due to Lenz law. After the RBS mode is on, the bicycle slows down due to energy utilization by the front motor. We have implemented the regenerative braking and tests are being conducted in order to achieve the best possible results. The conventional brakes are present in the e-bike in case of emergency braking as in RBS braking the cycle slows down gradually and not instantly.