Hi,
Quote:
Originally Posted by brick
. . . Have you discussed that estimate in a thread here or anywhere else? If not it might be worth a discussion.
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It is consistent with postings in the Prius Technical Stuff group. I've been able to replicate the data.
Quote:
Originally Posted by brick
That figure sounds a bit high to me but then again I haven't sat down and tried to do it on paper, myself. I suppose it also depends on if you are strictly talking about the battery (energy extracted from the battery divided by energy sent to it) or if you are talking about the full trip from engine to generator to battery to motor and finally back to mechanical via whichever MG drives the wheels.
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It is the sum of the discharging energy minus the sum of the charging energy:
Time Battery W
. . .
1577.5 2,853.3
1578.5 3,129.9
1579.6 4,253.8
1580.6 2,216.8
1581.7 1,046.2
1582.8 -5,091.8
1583.8 -6,063.2
1584.9 -5,953.5
1585.9 -5,674.2
1587.0 -5,627.8
. . .
Quote:
Originally Posted by brick
My gut feeling is that 94% might be close to reasonable for the electrical pathways alone but probably not so much for the whole "round trip" from engine to driving the car. I'd be interested in your assumptions and the methodology used to get to that number.
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The battery voltage and current are reported by the battery ECU to a Graham miniscanner and recorded to a text file. The data is recorded into an excel spreadsheet and the battery power, current times amps, used to calculate the discharge (+) or charge (-) power. The test distance was 5 miles at a fixed speed over a closed loop using the same entrance and exit.
Bob Wilson