A Field-Oriented Regenerative Braking Control for Electric Vehicles

Abstract

Most electric vehicles design use regenerative braking to convert energy losses during braking back into battery. there have been studies with several approach. Some research is evaluation and functionality test of regenerative braking system, but the system is still to improve and modify. The author proposes a braking mechanism using variable ADC (analog to digital converter) to control the intensity of braking. The braking system is use to to slow down the speed of the vehicle or even stop a running vehicle. The author is proposes to combine the mechanical braking and regenerative braking to optimize braking system, because if only use regenerative brake, the vehicle is not stop properly. A system of regenerative brake is convert kinetic energy from vehicle to battery via BLDC hub that control by converter. This converter can manage the intensity of braking during deceleration. An integrated braking system for electric vehicles using Field-Oriented Control (FOC) method is proposes to achieve optimization between braking performance and mechanical endurance. Unlike from the conventional FOC algorithm , the braking system in this research inverse the direction of the magnetic field force of the BLDC stator coil from driving to braking . the FOC braking is better control during electric vehicle braking and energy savings. The energy recovered from braking was 11.7% of the energy consumed during acceleration. The experiment was conducted on a road with real-time data logging to measure the energy recovered from the braking process, using a modified 250-watt BLDC motor. it can be concluded that the energy recovered from braking was 11.7% of the energy consumed during acceleration.