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Can Hydraulic Hybrids Compete With Electric Hybrids?

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Mydesign
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Re: Advantages of hydraulic hybrids
Mydesign   2/11/2014 6:17:24 AM
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"The cost of Hydraulic system is around $2500 however electric hybrids just engine cost is too high . Hydraulic hybrids are easier to recycle plus it doesnot involve any minning of precious metals. My design i dont have the authentic proof but mentioned below is the link from where i got the information."

Debera, thanks for the information and link.

Debera Harward
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Re: Advantages of hydraulic hybrids
Debera Harward   2/11/2014 4:12:18 AM
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The cost of Hydraulic sustem is around $2500 however electric hybrids just engine cost is too high . Hydraulic hybrids are easier to recycle plus it doesnot involve any minning of precious metals .

My design i dont have the authentic proof but mentioned below is the link from where i got the information .

http://ecomodder.com/forum/showthread.php/hydraulic-hybrid-vs-electric-hybrid-10186.html

shjacks45
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Bronze
Re: Hydraulic drive is a dead end.
shjacks45   2/10/2014 7:13:16 PM
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Aren't we supposed to be engineers? The first hybrids in wide use were diesel-electric locomotives and ships in the 1950's (first used in the 1920's). Frictional losses in automobiles although existent is trivial compared to very large vehicles. Although losses in automatic (hydraulic) transmissions in cars have declined from ~20% when introduced to around 5%, but still higher than "electric transmission replacements". Larger trucks now have automatic transmissions because power loss in automatics (~10%) is par with mechanical transmissions, but with lower maintenance cost. By the way trucks (and school buses, a subset of transit buses, which they are derived from straight trucks) do have a hydraulic "energy storage" in the "thrust converter" (see Caterpillar pages). And does anyone see how ridiculous it is for EVs to have a mechanical transmission and differential when that lost energy can obviated with direct wheel drive? There are already electric bicycles and scooters with the rim being part of the motor. In the 70's we built EVs with a motor per wheel. The raison d'etre of diesel-electric is direct drive of the wheels.

Wikipedia notes Diesel-Hydraulic has 20% less efficiency than Diesel Electric. Cost and maintenance also higher.

Charles Murray
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Re: Drivetran Size
Charles Murray   11/5/2013 8:01:05 PM
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Yes, nyeng, garbage trucks are another natural fit for this technology.

nyeng
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Re: Drivetran Size
nyeng   10/29/2013 6:39:59 AM
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It's a great idea for school buses and garbage trucks.  Saves fuel and saves brakes.

Charles Murray
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Re: Drivetran Size
Charles Murray   10/24/2013 8:09:20 PM
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Yes, tekochip, school buses are a natural fit with all the stopping and starting they do. Some time back, Ford teamed with Georgia Tech to create a hydraulic hybrid school bus.

http://www.news.gatech.edu/2011/05/13/georgia-tech-and-ford-collaborate-green-eco-school-bus

tekochip
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Drivetran Size
tekochip   10/24/2013 2:11:32 PM
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I have seen film of school busses being outfitted with this system and they were a natural fit because there is a great deal of room underneath the system for all the tanks required.  Add to that, they spend a great deal of time stopping and starting.  I think a passenger vehicle would be a pretty tough fit because of the extra weight and size of all the plumbing.
 
In the same film I saw a mechanical system that used a large spring to achieve the effect.  The spring stored energy during braking and released energy when the vehicle was started again.  I believe there was a compressed air version as well.


Mydesign
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Re: Advantages of hydraulic hybrids
Mydesign   10/24/2013 7:23:37 AM
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"Brake energy regneration effeciency of hydraulic hybrid vehicles is 80 percent and that of electric hybrid vehicle is of 30 percent ."

Debera, it seems that in hydraulic hybrid vehicles, brake energy regeneration efficiency is veru high when compare with the electric hybrid vehicle. That's a new info for me; if you have any supporting docs, please share.

Mydesign
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Re: Advantages of hydraulic hybrids
Mydesign   10/23/2013 11:58:53 PM
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"The first is that, unlike electric hybrids, there isn't an ultimate zero-emission goal."

Charles, why? That's also important, am I right.

William K.
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Platinum
Re: Has been investigated before
William K.   10/23/2013 9:28:44 PM
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Charles, the way things workj at Ford is that there are stages of research projects where it is forbiden to talk to any outsider about any aspect of the project. Then there are stages where they will be happy to talk.  So evidently thr project is in the non-talking stage. One should not mess with that portion of their policy.

But one thing about the hydraulic hybrid is that there is a whole lot of knowledge base already in existance, just waiting to be tapped into. The other advantage is that stored hydraulic energy and power are not going to ignite themselves because of some problem.

And I seem to recall a conversation like this a couple of years ago. What didn't happen??

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