Evaluation of Electric Vehicles as an Alternative for Work Trip and ...
Evaluation of Electric Vehicles as an Alternative for Work Trip and ...
Evaluation of Electric Vehicles as an Alternative for Work Trip and ...
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is 65 mph. One 1.4-mile stretch h<strong>as</strong> a const<strong>an</strong>t 3 percent grade (see<br />
Figure 7). In six drives to UConn during June <strong>an</strong>d July in 1998, the<br />
ALAB car could not maintain the 65 mph speed on the 1.4 km section with<br />
the 3 percent grade. At full power, speed gradually dropped from 65 mph<br />
to about 57 mph <strong>an</strong>d held steady thereafter to the crest <strong>of</strong> the hill.<br />
The ALAB car r<strong>an</strong> well in May <strong>an</strong>d June, <strong>an</strong>d 48 single-charge drives<br />
were completed. However, just seven weeks after the car entered service<br />
with the new ALAB, problems developed with battery #4 after a 56-mile<br />
drive on July 5, 1998.<br />
FIGURE 8 Voltage pattern in 1998 ALAB reveals that battery #4 is<br />
very weak by discharge cycle #50, July 5, 1998<br />
The graph produced by the battery m<strong>an</strong>agement system describes the<br />
energy usage on that drive (Figure 8). The x-axis represents the depth<br />
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