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Old 05-27-2011, 05:38 AM   #4801 (permalink)
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Did you see the controller settings database? My pack is also 144 volt so I started with Joe's settings, which I would classify as a sport mode for my car which is a bit lighter. The throttle was very responsive, but the ah figures reported by the controller for the same journey compared to the default settings seemed a bit higher, so I have now settled on this.

Kp 2
Ki 20
t-pos-gain 11
t-pwm-gain 0
motor-os-th 90
motor-sc-amps 30
bat-amps-lim 300

Best thing to do is try changing one parameter at a time and seeing what effect it has on your vehicle.

BTW, I got my new heatsink fitted and the controller is running a lot cooler now. I can still get a peak of around 50C when climbing a hill at 60mph, but I think some improvement to airflow around the controller would help.

500 miles on the car so far and all is well with the controller.

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Old 05-27-2011, 05:48 AM   #4802 (permalink)
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I believe it is all about how and how fast controller can match its output with your input (throttle). In ideal situation there is no overshoot and time to match the goal is close to zero.

See CTM: PID Tutorial

Because every system is different there is no way to make one setting that is "good" for all. Motor and voltage are the variables.

When rise time is high (controller reacts very quickly to throttle changes) the output will shoot over the desired result. This overshoot is reduced with other parameter (Ki?). Faster correction might result in undershoot and slower correction long stabilizing time. Output will bounce over and under its desired value before settlng. Timeframe for this whole operation might be something from milliseconds to a second. If output value is bouncing too much you might experience rough starts or motor revving up a bit when letting go of throttle pedal quickly.

Slower rise time results in less bouncing but lack of response.

Is lower Kp higher or lower rise time? What about Ki? I'm not sure. I experimented with mine until I found somewhat right settings I felt happy with. Playing with these settings made good difference in response. Sometimes during testing it was really awful though, hehe.

Now somebody please correct if this is total bull. I've understood the whole Kp/Ki thing this way.

Oh, I have almost 1500 miles on my controller. Doing great.
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Old 05-27-2011, 10:04 AM   #4803 (permalink)
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Why does MrBigh's controller have soda can's bolted to it?

Oh dear God! Those are capacitors?!!?


It would be funny to paint them with the artwork from an energy drink can, or maybe Jolt Cola.....
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Old 05-27-2011, 10:57 AM   #4804 (permalink)
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Thank you for the very simple PID tutorial
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Old 05-27-2011, 11:02 AM   #4805 (permalink)
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Quote:
Originally Posted by bennelson View Post
Why does MrBigh's controller have soda can's bolted to it?

Oh dear God! Those are capacitors?!!?


It would be funny to paint them with the artwork from an energy drink can, or maybe Jolt Cola.....
With the exception of the controller's PC Board and its parts, everything else is recycled and/or stored components.
I had the layout and mechanicals made for a year already; was waiting for Paul's newest controller version to complete this project and it's almost operational.
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Old 05-27-2011, 12:11 PM   #4806 (permalink)
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Quote:
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It would be funny to paint them with the artwork from an energy drink can, or maybe Jolt Cola.....
What a Revolting idea.
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Old 05-27-2011, 12:17 PM   #4807 (permalink)
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I like the layout - and Ben get some REVOLT SODA sleeves to fit Big Caps... would look kool ....
PS getting ready for MREA?
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Old 05-27-2011, 02:46 PM   #4808 (permalink)
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Open Revolt Controller

Here is a preview of my version of the OpenRevolt Paul & Sabrina's motor controller version.
.................................................. ....with some open revolt decals


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Last edited by mrbigh; 05-27-2011 at 10:09 PM..
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Old 05-27-2011, 02:55 PM   #4809 (permalink)
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is...........is that a 4 cylinder??
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Old 05-27-2011, 03:30 PM   #4810 (permalink)
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is...........is that a 4 cylinder??
Noooo, 4 piston OpenRevolt

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