Quote:
Originally Posted by dcb
and without a recharge/regen facility it is just a transmission. You don't get to store energy and downsize the ICE.
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Actually you do get to down size the ICE considerably... even without any traction buffering batteries in the system.
ICE low RPM torque sucks compared to an electric motors low RPM torque... even diesels.
Because the train will still have just as many tons worth of mass contributing to inertia and static friction to get moving at near zero RPMs... or at low speeds up long steep hills.
To get that same pull out torque or hill climbing torque you would need to considerably oversize the ICE for those low RPMs.
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Also ... diesel-electric trains even without traction batteries do regenerative braking ... they convert mechanical power into electrical power ... this is another efficiency benefit as even without storage for the electricity it is more efficient and cheaper than using giant friction brake pads to accomplish the same task.
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The term Hybrid does not require multiple energy storage ... a Killer Bee is a Hybrid insect ... but does not store energy any differently than other honey bees... Hybrid plants do not store energy any differently than non-hybrid plants.
Some hybrids can be energy source , or energy storage hybrids ... but the term hybrid is not exclusive to energy storage methods ... this is clearly evident in the widely accepted usage of the term hybrid in other aspects of language.