Hybrid vehicle question
Spiral_72
Posts: 791
I like thinking about things.... granted I'll probably never do it, but I wonder if anyone would care to share in my daydream.
I poked around on the internet looking for some kind of generator, maybe 160VDC at 200A. The hair-brained idea was to use the tried and true train engine idea for a beater car.... just for proof of concept and an engineering challenge. Besides, my poor old car has 262k miles on it and won't live forever. With this..... it might be able too [noparse]:)[/noparse]
If I run 144V, that should get me to 75mph for the trip to work. I'd drive the car with a big Advanced DC motor (or two) connected directly to the differential. Obviously I'd have to gear the car for that purpose, so RWD for simplicity.
A small 3 or 4cylinder gas engine running part time for the charging system sized to the torque demands of the generator, no transmission and maybe a centrifugal clutch? Maybe no clutch and no starter and use the car's inertia to kick the gas motor off again through a big Nexen toothed clutch..
Batteries for an EV are expensive, so this would use half the cells and they SHOULD last longer since I'd not be doing any deep discharges.
Any ideas on the generator?? I looked at windmills for the generator, rewinding alternators.... I dunno??
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"puff"...... Smile, there went another one.
I poked around on the internet looking for some kind of generator, maybe 160VDC at 200A. The hair-brained idea was to use the tried and true train engine idea for a beater car.... just for proof of concept and an engineering challenge. Besides, my poor old car has 262k miles on it and won't live forever. With this..... it might be able too [noparse]:)[/noparse]
If I run 144V, that should get me to 75mph for the trip to work. I'd drive the car with a big Advanced DC motor (or two) connected directly to the differential. Obviously I'd have to gear the car for that purpose, so RWD for simplicity.
A small 3 or 4cylinder gas engine running part time for the charging system sized to the torque demands of the generator, no transmission and maybe a centrifugal clutch? Maybe no clutch and no starter and use the car's inertia to kick the gas motor off again through a big Nexen toothed clutch..
Batteries for an EV are expensive, so this would use half the cells and they SHOULD last longer since I'd not be doing any deep discharges.
Any ideas on the generator?? I looked at windmills for the generator, rewinding alternators.... I dunno??
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"puff"...... Smile, there went another one.
Comments
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- Stephen
My take on it would be to size the battery pack large enough to make it to work, once at work start up the generator to charge the batteries.
Of course you could use a bs2 or a prop to take care of things automatically.
-dan
www.google.com/search?hl=en&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&q=series+hybrid&aq=f&aqi=&aql=&oq=&gs_rfai=
www.google.com/search?hl=en&client=firefox-a&hs=VHC&rls=org.mozilla%3Aen-US%3Aofficial&q=ev+motor+converions&aq=f&aqi=&aql=&oq=&gs_rfai=
www.curtisinstruments.com/index.cfm
I have some experince in EV conversions in trucks . [noparse]:)[/noparse] My ideal truck is a CNG fed 15kW genny in the front and Yes Direct drive ADC 80HP motor On flipped diff with 220V drive system.....
Peter KG6LSE
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"Carpe Ducktum" "seize the tape!!"
peterthethinker.com/tesla/Venom/Venom.html
Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway. —Tanenbaum, Andrew S.
LOL
Here's a link for do-it-your-self high end vehicle conversions http://www.metricmind.com (only all electric).· I noticed for the cost of some of the components you could buy a used Hybrid.
http://www.poulsenhybrid.com/ A proposed hybrid·conversion·that is not yet availible.
Post Edited (AJ-9000) : 7/3/2010 5:41:26 PM GMT
A lawn mower engine!!!??? Smile I hadn't considered the possibility of 100A with an engine that small. I mean even an 18Hp doesn't hardly seem big enough. Thank you for the link. Now where can I get a jet engine starter ??
I guess I was doing my research the wrong way..... looking for parts instead of completed projects.
Yea, a small pickup sure would simply things. A small Ranger or S10 should have a diff with commonly available gear changes... I figure gear it for most efficiency at 65/70mph with little to no regard for acceleration.
The most impressive pure EV I've seen so far was the "White Zombie" of something like that..... It's crazy fast at the dragstrip.
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"puff"...... Smile, there went another one.
A 5hp lawnmower engine (again assuming 100% efficiency) could produce 310A at 12V, 103.3A at 36V, or 16.93A at 220V.
Believe me, I'm not being critical, I'd really like to know:
Where do you get your figures from??? I'd have thought "average car....power....60mph" would be a figure of torque not horsepower. I know that HP is a function of torque at speed, but torque is the ability. Aren't electric motors typically sized for the torque they develop?? I purchase AC motors by HP all the time for work, but the real spec I'm looking at is torque. The HP number is given for convenience because it's understood the motor will spin 1800rpm, or 1200rpm or..... I can justify a given motor because I know final output speed and required torque.
Maybe that 20hp minimum you stated is the minimum power required of all gear ratios tested for a "typical" vehicle..... and would then imply some motor speed. I'd be really interested to know the torque and gears they used for that number if you have a link!! Maybe I'm beating this detail to death..... But more info would be interesting for me.
Thanks for the thoughts fellas... The more I think about it, that jet engine starter would be perfect. It's rated for high power and speed over minutes of use, unlike a typical automotive starter. Previous to that idea, I figured the best bet would be to wind my own alternator. I could use the trusty ol' BS2 to handle voltage regulation [noparse]:)[/noparse] Anyways, I'll see if ebay has any jet parts [noparse]:)[/noparse] HA!
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"puff"...... Smile, there went another one.
28V at 650 AMPS!!!! DANG!
http://cgi.ebay.com/RAF-Aircraft-Rolls-Royce-Dart-Jet-Engine-Starter-Motor-/140420673180?cmd=ViewItem&pt=UK_CPV_Aviation_SM&hash=item20b1b96e9c
I kinda wonder why most (all?) EV's are high voltage?? I've run across low voltage motors that have earth moving torque..... torque that might power a vehicle with the OEM "highway" running gear..... of course a motor such as this would need a boat anchor controller and contactors..... Maybe that's it [noparse]:)[/noparse]
Again, thanks. I'm going to monitor this thread in case anyone has anything else to add. I don't know that it'd be proper to continue this on a Parallax site even under the Sandbox.
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"puff"...... Smile, there went another one.
They provide serious power and there is no room for mistakes in sizing the contactors and cabling. Good rpm range up to about 8000 rpm and relatively easy to control as they have a shunt field which·was used when they became the generator for the aircraft. They also make a good DC arc welding generator.
·· Simple setup is best. I mounted the flywheel and clutch on the motor shaft then mated the arrangement back on the manual transmission.·Replace transmission gear oil with automatic transmission fluid for minimal friction.·Same with differential.
·Trying to add a small gas generator is probably not worth it other than an insurance package if you get somewhere without a charging receptacle.
··When I redo the project with my Ranger, I'm buying a 120 - 144 volt motor·with a matching DC drive which are now available from several sources. The ultimate question is, do you want to drive an EV or work on an EV!
Cheers,
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Tom Sisk
http://www.siskconsult.com
·
I don't recall the exact source of the 20HP requirement but it was the amount of energy required to overcome the resistance of an average car due to air friction at 60 mph, rolling resistance of the tires, and friction in the motor and drive train. That was quite a while ago, and the average car may be a bit lighter and have lower resistances now, so the power requirement might be a bit less but I doubt it is much less. An 18HP lawn tractor might be enough now.
If I were building a hybrid for one or two people now I would make it as light as possible. Possibly a frame made from chrome-moly tubing and a fiberglass body. The low weight reduces the static and rolling friction of the vehicle, and the shape of the body reduces the friction from air resistance.