Driving Evaluation Data
Posted on July 29, 2010
ChargeCar Team
The bad LiFePO4 cell was replaced with a cell we charged last night and topped-off this morning. The BMS incorporated it perfectly and the cells are all within +/-0.02 V of one another. Another issue we encountered yesterday were potholes. The small sharp shocks seem to trip the contactor (essentially a large relay or electromagnetic switch) and the throttle could cut out for brief periods. We resolved this by raising the holding voltage on the contactor.
The Civic was just driven around the same 7.2-mile course (three laps of a circuit in Schenley Park) in the exact same manner as the Scion. Good news! There were no faults of either the contactor or battery pack. The batteries have still not shown any significant increase in temperature. We did experience some heating on the motor and controller - still far from the maximum specified temperatures. Perhaps this could be a solution to our windshield-defrosting and cabin-heating issue....
At any rate, the data we have collected from this drive should be an excellent first pass at comparing the efficiencies between the Civic and the Scion. After the drive we recharged the battery pack with 1.80 kWh. This is fantastic news! That means that our 7.2 miles was driven at a rate of 4 miles per kilowatt-hour, pretty great as far as converted electric vehicles go! Granted, this was driving conservatively (keeping the current out of the 100 V pack under 100 A) and with regenerative braking. More updates soon.
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