Rresearch On Pure Electric Vehicle Braking Energy Recovery Technology Based On Ultracapacitor

Automotive energy saving technology has become a hot research and development, andthe current electric vehicle braking energy recovery efficiency is low urgent problem.In this paper, the electric vehicle braking energy recovery efficiency low currentsituation, analyze the causes of the low electric vehicle braking energy recovery efficiency;according to electric vehicles braking mode, design principles and constraints brake energyrecovery system, using Changan Benben mini electric cars for the experimental prototypevehicle, its braking energy recovery system is a definite improvement, and one of the mainstructure and performance parameters were set; works elaborated improved braking energyrecovery system. Improvements to the design after the brake energy recovery system, theuse of vehicle dynamics, motor theory and control theory to the motor, super capacitors,regenerative braking and vehicle control strategies were modeled by using Matlab/Simulink software system model simulation analysis, the validity of the theory brake energyrecovery system.In order to further improve practical and experimental verification correct and effectivedesign solutions, while comparing the simulation results, build a simple simulation ofbraking energy recovery units. The improved design of the energy conversion device(motor and drive system, the power converter), the control device (motor controller),the energy storage device (lithium batteries, super capacitors), the assay for the selectionand setting means; elaborated the experimental content and experimental methods, the firstsuper capacitor energy storage properties of a series of experimental studies conducted bythe experimental method, the results show that early super capacitor, was the end of alinear relationship between the voltage, and get in a pure electric car theoretically quadraticrelationship between the braking energy back under the super capacitor initial voltage andbrake energy recovery efficiency, and got MATLAB/Simulink simulation. Then wepropose two brake energy recovery mode and two pure electric car start-up modes, and useit as experimental content, describes the experimental methods. EXCEL software and usingthe experimental results were analyzed and calculated to obtain a change in status of thebraking energy recovery power with speed; fitting equation of energy use and energyrecycling efficiency. The experimental results were compared with the simulation resultsverified that the improved practical design solutions as well as correct and effective, andcompared with the original car, pure electric vehicles using lithium batteries in parallel ultra capacitors and automotive startup mode, the pure electric vehicle start-up time will begreatly shortened.