INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

EV range extender

RE: EV range extender

It actually makes a lot of sense.

Mike Halloran
Pembroke Pines, FL, USA

RE: EV range extender

(OP)
I am moderately terrified of the idea of applying substantial drive forces through the towbar, but i suppose it is no worse than towing a two ton trailer. The behavior in corners could be interesting.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?

RE: EV range extender

Greg,
Would you rather hitch it up to the front of your EV, and let it do the pulling? 2thumbsup

STF

RE: EV range extender

I regularly pull a 3-1/2 ton trailer with a 3 ton tow vehicle.

When the inter-vehicle connectors get corroded enough (the accepted standard connectors are not weathertight), the electric trailer brakes don't work, causing the trailer to push rather hard on the tow vehicle (which now has aftermarket slotted and drilled rotors on the front).

The push is, ahem, noticeable.

It would probably be a little less noticeable had I not installed a ProPride 3P hitch, which uses a four-bar linkage to pretty much eliminate sway, even with a slab-sided trailer like mine. In fact, rather than explaining what a four-bar linkage is, I just tell civilians that it's a damn miracle.
... but the linkage is bi-stable on deceleration without trailer brakes, or when backing.

A simple a-frame hitch would probably work okay for a pusher powerpack, and would probably sell fairly well to EV owners as they gain experience with EVs, especially if it were small enough to be unobtrusive.
Will EV designers put enough structure in the rear of their product to accept a hitch? ... anyone's guess.







Mike Halloran
Pembroke Pines, FL, USA

RE: EV range extender

Battery trailers aren't new- back in the day of "lead sleds" (cars converted with lead acid batteries) it was often the only way to fit enough battery to make the range tolerable. That one is a bit novel, using the front rather than the back of the car to make the trailer out of.

My 100 km (60 miles) range is perfect for my trip to work and back, and only a bother if there's no plug at the other end of my trip. If I go to distant car shows I have to make sure there's somewhere I can plug in to make the return trip...then again, 18.5 kWh worth of battery was all I could afford in the converted car at the time. I could likely fit almost that much again if I didn't mind losing the space behind my seats and the trunk (boot), but that would mean new suspension for sure.

RE: EV range extender

...and if I do get stranded, towing the car is the fastest way to recharge it! In fact, this is often used by EV racers since the tracks don't have high current DC chargers available yet.

RE: EV range extender

Kinda not really in the spirit of the EV thing, eh? :)

The problem with sloppy work is that the supply FAR EXCEEDS the demand

RE: EV range extender

Greg, you didn't really mean "pushing" the EV along did you? Or did you mean supplying it with electrical power while on the move, which I assume is why you made the Chevy Volt comment?

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

RE: EV range extender

Not with a single point hitch... One bit of slippery pavement under one of the wheels and it would be 'jackknife' time.

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

RE: EV range extender

Looks to me like there's a huge battery pack in front of the hood (boot) of the towed vehicle front end...if not, just what exactly is that big black box with the red compression straps on it?

Agree that a single point hitch "pusher" like this would be ridiculously dangerous...

RE: EV range extender

That black box may be the fuel tank! You can clearly see an exhaust coming out the back so I suspect the reason for using the front of the donor car is to use the entire front wheel drive power train.

Love the strategic use of duct tape.

----------------------------------------

The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

RE: EV range extender

So, who's in charge?

The problem with sloppy work is that the supply FAR EXCEEDS the demand

RE: EV range extender

How's this for a range extender?

"I have not failed. I've just found 10,000 ways that won't work." Thomas Alva Edison (1847-1931)

RE: EV range extender

Wow! A Bennet Buggy. The Canadian version of a Hoover Cart
During the great depression in the 30's, Canada's Prime Minister was R.B.Bennett.

Quote (WIKI)

A Bennett buggy was a term used in Canada during the Great Depression to describe a car which had its engine and windows taken out and was pulled by a horse. In the United States, such vehicles were known as Hoover carts, named after then-President Herbert Hoover.


Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: EV range extender

Given that "Smart Car" has a fuel door (it's likely not an electric model), I doubt the horses would add any meaningful range. The electric models have their charging port in the same basic place as that fuel door, but it has a somewhat different shape unless I'm mistaken.

A guy at www.diyelectriccar.com converted his diesel Smart to a fully electric version using a large 11" series-wound DC motor and a pack from a crashed Chevy Volt. The thing is absolutely insane from a performance perspective- scary...

RE: EV range extender

MM,
Somehow, I think that horse+smart combination is photoshopped.
At least, I think I could fake it convincingly, given the right two pictures to start with.

STF

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close