The Electric Car
in [Design]
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From: Eeyore on 2 Aug 2007 14:08 Nobody wrote: > None of the major car makers are going to abandon ICE technology soon, so they will be > looking to "dual-purpose" as much of their existing technology and infrastructure as possible. V8 hybrids ? Don't be so ridiculous. If US auto makers don't change their ways soon, they'll be out of business. Graham
From: Eeyore on 2 Aug 2007 14:10 Nobody wrote: > If you design an engine purely for a serial hybrid, the result isn't going > to look anything like a normal car engine. The same applies to much of the > rest of the car: wheels designed for embedded motors won't look like those > designed for an axle. That's exactly the point. A series hybrid probably only needs about a 500cc engine. Graham
From: Mark on 2 Aug 2007 15:24 > > It seems to just argued against using any electric motors at all. > Yep, I think the small batteries and electric motor in the Prius are there for only 2 reasons.. 1) efficency gained by regenerative braking 2) improve the acceleration so the ICE can be smaller also improving the efficency. If you had the small ICE without the acceleration boost provided by the electrics, the acceleration would be poor and people would not like the "drivablility". Intersting to note that a flywheel could provide the same advantage. In fact I tend to think of the battery and electric motor in the Prius is just an electric implementation of a flywheel. Mark Mark
From: Nobody on 2 Aug 2007 19:19 On Thu, 02 Aug 2007 12:24:27 -0700, Mark wrote: > Intersting to note that a flywheel could provide the same advantage. > > In fact I tend to think of the battery and electric motor in the Prius > is just an electric implementation of a flywheel. There has been research on using flywheels, primarily for buses. The problem is that you need a (relatively high-torque) variomatic transmission to avoid shearing the gears and/or incinerating the clutch. With the electric approach, the variomatic transmission is achieved through PWM, which seems to be better understood than the mechanical equivalent.
From: Glenn Gundlach on 2 Aug 2007 19:47
On Aug 2, 4:19 pm, Nobody <nob...(a)nowhere.com> wrote: > On Thu, 02 Aug 2007 12:24:27 -0700, Mark wrote: > > Intersting to note that a flywheel could provide the same advantage. > > > In fact I tend to think of the battery and electric motor in the Prius > > is just an electric implementation of a flywheel. > > There has been research on using flywheels, primarily for buses. The > problem is that you need a (relatively high-torque) variomatic > transmission to avoid shearing the gears and/or incinerating the clutch. > > With the electric approach, the variomatic transmission is achieved > through PWM, which seems to be better understood than the mechanical > equivalent. Also the issues with gyroscopic precession. Less than good here http://blogs.edmunds.com/Straightline/2257 Interesting here http://www.cleangreencar.co.nz/page/prius-petrol-engine GG |