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Originally Posted by brick
Thanks for the explanation, that does make sense. I'm going to have to look into one of these Graham miniscanners if they aren't obscenely expensive. Or maybe CAN view would work. But what you have me thinking is that we might be able to estimate the round-trip efficiency for a regen--->battery--->propulsion cycle (kinetic to kinetic) through a controlled test. The crude methodology might be to start at a known speed (and kinetic energy) below 41mph and a known battery state of charge, allow the vehicle to coast down to a lower speed (and KE) threshold while noting the new battery SoC, then accelerate under EV and note the speed attained when the battery reaches its starting SoC. It would be desireable (more like crucial) to estimate energy losses to things like rolling resistance and aero drag in order to isolate internal system efficiency. Even better to record battery voltage and current throughout the test series to help give an idea of the magnitude of losses in either direction.
I'm just rattling this off without doing a proper experimental design so no doubt there are holes to be filled.
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Actually I'm impressed and pleased. One of the harder things in life is to find collaborators who understand technology and how to approach these kind of problems. When I see someone with "the lights are on and someone is home," I want to shout out, "Welcome fellow engineer!"
You might want to wander over to the Yahoogroup, "Prius_Technical_Stuff" and take a look at the files and search through some of the message archives. This will 'open your eyes' and help you see some of the really interesting experimental stuff that is going on. In particualar, take a peek at what "Hobbit" has been doing.
We'll still share results and summaries here. What we learn is important and can help less technically inclined folks 'get a clue.' But the folks in that group 'play with fire' and sometimes 'the smoke escapes.' We're a friendly group of geeks.
Bob Wilson