there are many ways to do it, in the one George Spratt did he did not use
any of the original computers, just a starter motor and a 3 PH bridge on the
MG to provide DC. I don't really know which way would be best at the moment.
The Prius engine is very efficient, and that is past of the reason for the
low fuel consumption. Narrow piston rings and bearing shells etc to reduce
friction 13.5 to one compression etc. Also the "miller cycle" so you can
reduce output power by changing the inlet valve timing, this, together with
the 16 valve setup can almost eliminate pumping loss to give diesel like
economy. You could take out either MG1 or MG2. and some of the mechanics to
reduce weight. The engine it's self is the same as the NHW20, it's just used
at lower revs and the "gearbox" is very similar too, only reason for using
the NHW10 is that I have a couple, and they are available here very cheap.
You could use a NHW11 in USA. The NHW20 has the DC-DC converter which could
make it easier to match the MG output voltage to the EV's battery voltage.
What car do you have in mind?
-----Original Message-----
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Cor van de Water
via EV
Sent: 17 February, 2017 9:00 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Generator?
The Prius is not the first vehicle I would consider for this, but if you are
going down this track then there are a couple remarks / additions /
questions:
- Are you suggesting to essentially do the "pusher-trailer" by using the
motive (front wheel drive) power from the Prius? If that is the case then
the optoin to generate electricity and recharge the EV pack is just an
additional benefit, not the main feature of the trailer, since you can use
the trailer to maintain speed and only use the EV power to accelerate.
- you will have to keep a 300V (273.6V nominal) battery pack, which is not
the strong point especially of the NHW-10 with its D-cell stacks.
- if your EV pack is close enough to the 300V of the Prius, you might
consider hooking it up instead of the Prius pack and add a resistor divider
array (19 resistors) to keep the Prius BMS happy if needed to keep the Prius
going. Added benefit could be that the Prius will maintain (charge) the EV
pack if indeed close enough in voltage, but even a low lower voltage can be
used to allow the Prius to start its engine, my NHW-11 still made attempts
to start the engine at 150V battery voltage.
If you are unable to use the EV pack or simply don't want the direct EV
battery connection to cross over the hitch, you can still consider running a
charger off the Prius pack and use it to re-charge the EV while driving.
The interesting thing is that Prius has electronic throttle control and
accelerator pedal sensor, no direct linkage. So controlling it from the
pulling vehicle is a lot simpler.
If you are after an efficient pusher-trailer then even getting a cheap
(crashed) NHW-20 (2004+) should be considered. They do not even run the
engine until you press the accelerator or there is a need (battery
charging) so you can have it sit "idle" with the engine off until you need
the pusher trailer to start moving and simply pushing the accelerator will
start the engine and get you going!
Cor van de Water
Chief Scientist
Proxim Wireless
office +1 408 383 7626 Skype: cor_van_de_water
XoIP +31 87 784 1130 private: cvandewater.info
http://www.proxim.com
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-----Original Message-----
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of George Tyler via EV
Sent: Thursday, February 16, 2017 11:22 AM
To: 'paul dove'; 'Electric Vehicle Discussion List'
Subject: Re: [EVDL] Generator?
Verne Pavreal asked me to post this: Some time ago he and I were discussing
a range extender generator for an electric Nissan NV200 van he wanted to
buy, came up with the idea of using the front end of a Toyota NHW10 Prius, I
have a few. A friend of both of us in Auckland, George Spratt, has used a
Prius engine/ gearbox on a trailer to extend the range. He tested it against
a Honda inverter/generator (the most efficient he found) and got similar
consumption, so it's probably as good as you can get. George Sprat runs it
on wood gas now.
Lots of advantages, plenty of power, it's all there, trailer built
in. It could either be a pusher trailer or take out the drive mechanicals
and it's just a generator, or could be both. All the engine electronics is
there too! Depending on which way you go, you may need a starter motor:
there are other cars that are not hybrid that use the same block, so you can
get the starter from one of those like George Sprat has done. Engine
produces 40kw, but you may have to use both MG's to send all this to the
batteries. If you use a lot less you can set the valve timing to optimize
consumption.
-----Original Message-----
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of paul dove via EV
Sent: 16 February, 2017 5:03 AM
To: EVDL Administrator; Electric Vehicle Discussion List
Subject: Re: [EVDL] Generator?
Alan Cocconi designed the EV1 electronics for GM.
Sent from my iPhone
> On Feb 13, 2017, at 12:33 AM, EVDL Administrator via EV
<ev@lists.evdl.org> wrote:
>
> The most efficient EV APU I know of was the "Long Ranger" trailer Alan
> Cocconi built for his Honda Civic hatchback EV about 2 decades ago.
> He used a (Kawasaki?) motorcycle engine.
>
> http://www.evdl.org/docs/acp_lr.pdf
>
> I'm not sure the gadget advertised in the flyer linked above is the
> same as the one Cocconi actually used to drive his Honda EV all over
> the US. It says it generates 9kW and "extend[s the] range by 200
> miles per 5 gallon tank of fuel."
>
> That would be 40mpg, but I recall reading that the one Cocconi
> actually used with his Honda, which AFAIK actually could keep up with
> the EV's energy use on the highway, got a real world highway mpg of
32.
>
> For direct comparison, a similar Honda Civic VX or HF hatchback of
> about the same vintage got real world highway mpg in the 48-56 range.
>
> I don't think I ever read anything about exhaust emissions from
> Cocconi's APU. Anyone know how regulated motorcycle emissions were in
the
mid-1990s?
>
> Cocconi was (presumably still is) a genius engineer. I don't know
> about your engineering background, but I know for sure that I
> personally could never cook up something even that efficient and
reliable
in my garage.
>
> Apparently building an APU isn't quite as simple as just chucking a
> genset in the back and plugging your EV's charger into it. We've had
> quite a few discussions of fueled APUs on the EVDL over the years, and
> I recall reading reports of burned-out gensets, chargers, even
controllers. Be careful.
>
> Honestly, I think you'll get better results overall by just keeping an
> ICEV in the garage for long trips -- or renting one when you need it.
> Or you could just buy yourself a Chevrolet Volt. Be aware that the
> Volt's mpg in "charge sustaining" mode is decent but not all that
> impressive. EPA says 37mpg, and owners seem to get around 34-35.
>
> But if you're in it for the technical challenge, I guarantee that
> building and integrating your own fueled APU will give you plenty of
that!
>
> David Roden - Akron, Ohio, USA
> EVDL Administrator
>
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>
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>
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