Experimental Verification of Electric Vehicle Using Electric Double Layer Capacitor

Abstract

Abstract – This paper discusses to conduct experimental verification of two types of micro electric vehicles (EV) in order to realize improvement in electric mileage and shorten a charging time of the battery. First, electric double layer capacitor (EDLC) systems to use as a secondary battery are proposed. The internal resistance of EDLC is small compared with a rechargeable battery, and it is suitable for momentary charge-discharge of EV. Next, control circuits of the capacitors to increase the regenerative electric power are utilized. Then, a novel method to charge a main battery of the EV is introduced. Finally, experimental results demonstrate the validity of the proposed method. Keywords: E l ec t riVh ,ED oub L ay Cp ( ) Rg n v P w 1. Introduction Recently, electric vehicles research and development has been investigated in order to solve the problem of global warming and fossil fuel depletion. EV does not emit exhaust gas at the time of driving. Motor toque generates fast and accurate, and it can be measured precisely. Thus, the major advantages of electric drives are the effective control traction force applied between the tire and the road surface [1]-[3]. However, range between recharges of EV is shorter than internal-combustion engine car, because EV cannot load many batteries from restrictions of weight of vehicle or capacity. And, charging time of EV is longer than refueling time of internal-combustion engine car. Here, this paper verify new charger which employ a new charging method (Advanced I.C&C Technique) developed by Techno Core International Co., Ltd to shorten the charging time [4]. And then, this paper presents applications of Electric Double Layer Capacitor (EDLC) into rechargeable batteries [5], [6]. For example, the electric vehicle Capacitor COMS, which has only EDLC as the electric energy source, has been reported in the literatures [7] and [8]. Since EDLC is based on a physical reaction and the resistance is also small, the electric capacity is large and it is possible to charge and discharge rapidly compared with rechargeable batteries. In this research, EDLC is connected in parallel with main rechargeable battery in order to reduce the electricity consumption of the battery and increase regenerative power from the driving motor. Finally, experimental results demonstrate the validity of the proposed method by two types of micro EVs (COMS LONG and e-ZONE).