Forum readers will recall that Aerowhatt and I have been embroiled in a discussion as to whether regeneration and slower downhill descents will increase an i-MiEV's range as compared to putting the i-MiEV into Neutral and simply coasting down the hill. Aerowhatt is a proponent of coasting and, from a practical standpoint, I also do that all the time; however, the theoretical challenge on the table is still there.
The discussion boils down to whether there is a higher or lower amount of stored energy which results from a lowered aerodynamic drag (from going slower) and regen power plus the power consumed by the engaged motor/inverter combination when compared to simply coasting whereby the car is still consuming a steady (1.3A?) irrespective of speed. [That's an awkward sentence that needs to be rewritten]
The metric to prove/disprove this was the change in State of Charge between the top of the hill and the bottom of the hill. Unfortunately, the resolution of this reading (via CaniOn) is only 0.5%, which is inadequate for short-stretch controlled testing. In my case, I don't have a long-enough downhill where the car will coast at a fixed speed in Neutral.
Never one to give up I've gone back to looking at a short stretch (0.4 mile?) of freeway with a nice steady downhill where the i-MiEV holds a constant 65mph in Neutral. I'm willing to go back on a Sunday morning with negligible traffic and kick the i-MiEV into regen and thus go down this hill slowly in an attempt to prove (or disprove) the
hypothesis.
Let's ignore SoC, and try CaniOn's energy consumption over distance readout.
I haven't tried it, but if we reset CaniOn at the top of the hill and then take the Wh/km (or non-metric equivalent) reading at the bottom of the hill, using both driving techniques, will that prove anything? Let's discuss it before I try it.
Aerowhatt, you had published some compelling numbers in another thread which showed that engaging the motor/inverter was terrible compared to coasting in Neutral, but I couldn't readily find them. Perhaps summarize your findings on this thread?
Incidentally, the location of my "test" hill is (using Google Maps) 37.3860966,-122.2056714, but I have to re-learn to use GPS Visualizer and come up with an exact Start and Stop point on this road for the test.