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3drob
User Rank
Platinum
Better than electric but safe?
3drob   10/23/2013 2:59:18 PM
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Thanks for excellent post Charles!

I like the idea of a mechanical hybrid better than an electric hybrid for environmental reasons.  I remember a while back someone studied the lifetime energy cost of a Prius vs. an H3 (or an H2, I don't remember the fine details) and the Hummer won, mainly due to the production and EOL recycling cost of the Prius's exotic materials.  I would assume (perhaps someone can correct me if I'm wrong) that a hydraulic system would be a win-win for the environment (assuming nothing exotic in this system).

On the other hand, being someone who keeps vehicles for decades, I tend to think about post-warrantee issues a lot (my family has a fleet that includes an '88, a '94, a '99, and a '10).  That high pressure bottle makes me REALLY nervous (especially sitting right underneath the passenger compartment).  After 10 years I would fear it's become a corroded mess (it's located in a prime spot to collect water/salt), that may start to approximate an explosive device.

mrdon
User Rank
Platinum
Re: Re : Hydraulic hybrids
mrdon   10/23/2013 12:44:10 PM
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AnandY

Thanks for the clarification of why hydraulics are used in vehicles. It makes good sense to apply the technology to vehicles that could really benefit from improving their mechanical performance.

wbswenberg
User Rank
Platinum
Re: Hydraulic Hybrid two decades ago
wbswenberg   10/23/2013 12:32:00 PM
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I do not remember the car but I do recall a bus that used hydraulics.  I believe it was a german company and bus.

I also remember a guiding wire for busses.  It was used for smoothing the ride and not guiding the path.

etmax
User Rank
Gold
Re: Nice slide show!
etmax   10/23/2013 10:45:45 AM
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Ah ok, because I saw storage to store pressurised fluid I thought it was air seeing fluid doesn't compress (much).

 

ervin0072002
User Rank
Gold
Re: Nice slide show!
ervin0072002   10/23/2013 10:08:50 AM
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@etmax: I believe that this fluid will be a liquid. And yes you are right a lot of the energy is dissipated as heat but it will probably be more efficient then air. Also quitter then an air compressor since it will require a lower rpm. This is because when air gets compressed it changes density and the volume you have to transport is significantly higher than the storage vessel. Most liquids under pressure have insignificant density changes mostly. So the volume you move equals the volume in the pressure vessel.

phantasyconcepts
User Rank
Silver
Re: Nice slide show!
phantasyconcepts   10/23/2013 9:53:21 AM
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So, let me get this whole thing straight.  What we have is a hydrostatic drive system, similar to the bomblifts I used to fix in the Air Force, with an air compressor similar to the HiPACs (High Pressure Air Compressors) I also fixed in the Air Force, powered by a diesel engine, like the ones I fixed in the Air Force, pushing around a vehicle the size of the one I used to use to tow the HiPACs?  So, technically, my military training would actually allow me to fix every system on the vehicle again?  Damn.  Now I need to get more handcleaner because my hands are going to get greasy again.  And just when I was beginning to get fat and lazy from sitting behind a desk all day, someone has to come up with a use for my archaic training.

Crash
User Rank
Iron
70 mpg hydraulics 40+ years ago
Crash   10/23/2013 9:37:31 AM
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I remember an article in Mother Earth News back in the 70's, in which an eastern college had taken a VW chassis, and converted it to hydraulics.  They used a 16HP Briggs and Stratton engine to pressurize the oil and regenerative braking to gain efficiency.  With a fiberglass body (and likley no AC), they claimed to achieve better than 70 MPG!  I checked back with the college 10 or 15 years later, and they hadn't done anything further at that time with the concept.

etmax
User Rank
Gold
Re: Nice slide show!
etmax   10/23/2013 9:19:38 AM
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Hi Chuck, first thanks for digging this up.

I'm surprised it's that efficient only because of what I've read about compressing air and how it put's a lot of the energy out in heat.it suggests an efficiency of the system "input to storage - withdrawal from storage" of about 25%, which is I think is less than half of an electrical storage solution.

Also air piston engines aren't supposed to be that efficient either.

I wonder what it sounds like when it's running?

modorney
User Rank
Iron
Hydraulic Hybrid two decades ago
modorney   10/23/2013 8:30:25 AM
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About 20 years ago, I remember seeing a motivational video of a man driving a hydaulic hybrid automobile.  I remember about a 20 horsepower prime mover, and the actual car was a prototype open frame chassis, with no body.  Anybody else remember this video?

AnandY
User Rank
Gold
Re : Hydraulic hybrids
AnandY   10/23/2013 6:35:55 AM
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The concept of integrating hydraulics in hybrid vehicles is a good one but one that could easily misused if the ideas behind the creation of this technology are taken out of focus. Hydraulics are about increasing efficiency; more work for less energy. So it's not really suitable for all vehicles. Using it only on vehicles that really need that added efficiency is the way to go.

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