Application of Ultracapacitors on Energy Management System of Electric Vehicle
Date Issued
2005
Date
2005
Author(s)
Shu, Pu-En
DOI
zh-TW
Abstract
This research integrates ultracapacitor cells with traditional lead-acid batteries in the energy management system of electric vehicle. The application of ultracapacitor is motivated by the demand of instantly high current for acceleration, which diminishes the life cycle of lead-acid battery. The innovated energy management system consists of control center, a field programmable gate array, to organize series and parallel connections of ultracapacitors and batteries; ultrcapacitor cell is responsible for high current output during accelerating, while battery set is for lower current output during cruising. This proposed scenario takes the advantages of the high power density of ultracapacitor and the high energy density of lead-acid battery.
The novel enery management system has additional features–regenerative braking and display of residual capacity for batteries. The original full-bridge circuit of drive takes the task of regenative braking, fueling generated induced current back to ultracapacitor or battery set according to the driving status. During the vehicle motion, the residual capacity of bettery is estimated by the measurement of ampere-hours and transient open-circuit voltage, which is more accurate than pure voltage measurement on most of commercial electric vehicles. The regenerative braking circuit model is simulated with Is Spice, and the best gearshift is scheduled in the light of experiments. The driving standard ECE40B is finally used for the driving range test. Experiments show that the proposed energy management system with ultracapacitor provides 18% more driving range than the system without ultracapacitor.
Subjects
煞車回充
串並聯
ultracapacitor
regenerative brake
serial and parallel connection
Type
thesis
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