Quote:
Originally Posted by NeilBlanchard
Hi Dave,
Serial hybrids have batteries (and/or supercapacitors), and this is the basis for their strong advantage over ICE only vehicles. You can't compare serial hybrids to ICE only and ignore the electric mode -- this is why they are used, and it is why they are so much more efficient.
The corollary argument would be to insist that the ICE-only car has to use just one gear for the whole test. Hey, it wouldn't be fair to let it use it's transmission, because the serial hybrid only has one gear!
I'll take a serial hybrid with a discharged battery and you take an ICE and drive it in one gear and we'll see who gets better FE, okay?
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Serial hybrids have a single propulsion source.
Nothing limits that to electric motors.
As far as transmissionless that is also a misconception.
EVs have far to go in development and using a large primary drive motor will mean greater weight.
Green Car Congress: Antonov to Develop 2-Speed Transmission for EVs
Two speed transmission for electric vehicles.
I actually like the hydraulic energy damper for electric vehicles which has the ability to double (possibly triple) regenerative efficiency.
Also would allow for peak efficiency of primary electric motor operation and lightweight in wheel drives that are non electric.
If you can pulse a glide any vehicle, including BEVs, then you can improve their efficiency beyond their design limits.
That was demonstrated in 1970 with an Opel Kadett that managed 125 MPG while averaging 26 MPH using pulse and glide the year I turned 20.
The combined energy conversion processes involved in electric drives doom them to obsolescence.
The cost of storage dooms them to obsolescence.
The complexity and poor regenerative capacity dooms them to obsolescence.
On the other hand with in wheel drives and an accumulator with a single acceleration event capacity, allows you to do 0-60, back to 0. 0-48, back to 0. 0-35, back to 0. 0-28, back to 0. 0-23, back to 0.
That requires no consumption of any stored energy source, electric or liquid fuel.
In the typical scenario where you are commuting to work in heavily populated areas this is reality.
If you are recovering 33% of the energy the number of cycles becomes pitiful in comparison to the hydraulic option.
A typical 60-0 panic stop requires only 14 revolutions of a vehicles wheels. In those 14 revolutions you will never be able to recover 80% of the energy electrically.
When you realise this is factual, you should understand that there is another option.
It does not preclude battery power to the vehicle or the BEV option, but it does mean your power train will need to be hydraulic with an accumulator.
Why there seems to be a single minded obsession with all electric drives simply astounds me, especially in a forum where people should be dedicated to greater efficiency as well as realistic cost per mile calculations that determine the true feasibility of any practical form of transportation, regardless of the energy source.
But the we all have our agendas, right?
regards
Mech