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Old 01-07-2012, 10:07 PM   #5401 (permalink)
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Originally Posted by MPaulHolmes View Post
Pretty much all the 1000 amp stuff on the wiki is worthless.
Paul,

Let me know when you want to rev the 1K ReVolt files on the wiki so they aren't worthless.

-Mark

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Old 01-07-2012, 10:24 PM   #5402 (permalink)
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Hi Mark! I just meant that the other 1000amp attempts turned out not to work as well as I had hoped. haha. It really is the correct bill of materials for them and everything, but they just weren't very good I think. I'll send you the new stuff just as soon as I finalize the fixes from the prototype.
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Old 01-07-2012, 11:20 PM   #5403 (permalink)
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OOoo! My fuse is on the battery pack side. B+ I think.

I like that limiting battery amps feature! I'll have to try that!

The batteries are definately the weak link. USED and LEAD-ACID.

At least they are AGMs!

If there are any battery companies listening right now - I would gladly trade you a new set of batteries for a WHOLE lot of free publicity!

1.5 million YouTube views on my home-built electric vehicles so far, and I have devious mad-scientist plans for something EVEN bigger and better planned!
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Old 01-08-2012, 12:02 AM   #5404 (permalink)
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Aren't you supposed to be getting ready for a cross country, alternate fuel road rally? ...Or is that what you're referring to?
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Old 01-08-2012, 12:43 AM   #5405 (permalink)
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Well, not just a rally, but building a vehicle to do it, using a pile of Open Source and homebrew technologies, sharing all that, documentary film on it, etc, etc.

DIY X-Prize in a box.
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Old 01-08-2012, 07:35 AM   #5406 (permalink)
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Paul ,what would be the chances of getting my hands on one of those nice new 1ka control boards?
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Old 01-08-2012, 08:04 PM   #5407 (permalink)
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I have one more of the original control boards (out of 2 haha). I had told some guy up in Seattle, WA that he could try to put the other one together (control board, power board driver board), but I haven't heard back from him in a few days. I'm getting new ones made that have more safety features, probably in a couple weeks. So either you can have this one if I don't hear back from him soon, or you could get one of the next ones that have been fixed up a bit.
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Old 01-08-2012, 09:34 PM   #5408 (permalink)
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Wait a minute!

So the one I have is MISSING safety features!!?!?

I know I've been a guinea pig on this project, but this is rediculous!
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Old 01-08-2012, 10:44 PM   #5409 (permalink)
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LOL. Well, it has all the safety features of the regular old 500 amp version. I just added a few extra things to the newest one like disabling the PWM if the microcontroller latches up. I tested that circuit, by the way, and it works perfectly!

As far as touchy throttle goes, there are a number of things that we could do to fix that. I'm thinking that part of the problem is trying to fit 0 to 1175 amps in the same range as 0-500 amps. On the Zilla, Otmar doesn't use a linear throttle if I recall correctly. We could first try slower ramp up, and if that's no good, then we could make it something like this:

We could transition from a throttle that feels proportional to 500 amp of max current near zero throttle, and a smooth transition to a throttle that's proportional to 1000 amps at max throttle.

I may need to mail you a little programmer for it, since it doesn't have a bootloader. boohoo. They are pretty cheap though.

EDIT: Something like this:

currentReference = 500*(x*x + x), where x is the throttle position, and is [0,1]. For x close to zero, x*x is very small, so it behaves like 500*x. For x near 1 (full throttle), x*x + x is close to 2, so it behaves like 1000*x.

I think Otmar uses a cubic, so maybe something like:
500*(x*x*x + x). That would be like 500 amps for longer, and a more severe transition near the end of the throttle.

The top line is what the throttle is right now, next one down is 500*(x*x+x), the next one down is 500*(x*x*x + x), and the next one down is the throttle for the regular old 500amp controller. Notice how the 2 bend to mimic the 500amp throttle on the low end, and catch up to the current 1000amp throttle.



If those friggen algebra sudents tomorrow tell me that there's no use for parabolas, I'm going to whup them and show them this.
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Old 01-09-2012, 12:31 AM   #5410 (permalink)
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Paul,

I am always curious why people don't use the pedal for velocity control instead of torque control. I realize torque control is much more similar to current automobiles. However, I have an off-road electric vehicle that has a Kelly controller (not what I would recommend) and it has the ability to use either torque mode or velocity mode. The velocity mode is kind of like driving around in cruise control. I simply push down on the pedal relative to how fast I want to go and the controller adjusts the current to deal with the changes in load. It didn't take long at all to get use to this and I really like it now. Wouldn't this get rid of the touchy throttle?

Rick

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