It's very strange, but the problem seems to have gone away overnight! I didn't make any changes at all after my earlier update, but this morning there's no "dead throttle" problem. It responds from the very beginning. I'm going to continue to tweak the parameters to eliminate any remaining "pulsing" (mostly from PAS, not the throttle anymore), but I'll carefully and slowly change one parameter at a time. I don't understand how the problem could just disappear like this...
tanstaafl wrote:I'm having a strange problem with my CAv3. It's running the latest beta firmware. I recently increased my battery voltage to 60v nominal (from 36v) and I now notice a much more pronounced "pulsing" from both my throttle control and from my torque-PAS (TDCM). I've decreased both AGain and WGain a bunch, and the pulsing has decreased, but it's still there. As I decreased the gains, my throttle has started behaving "funny". I don't get any motor response until I "floor" the throttle, but after it starts up, I have reasonable control over the whole range. The throttle itself is working -- I can see the indicator change on the main CA display -- but I get no acceleration until I've moved it all the way. (and the pulsing is still there) (BTW, didn't mention this at first, but I've have the throttle set to control Amp -- but it had the same problem in pass-through mode -- maybe because of my watt limits?).
What are reasonable values fro AGain and WGain? The starting values seemed strange to me -- AGain was something like 150. I've reduced it an order of magnitude and will probably take it lower still. UPDATE: still a problem at 10. WGain was much lower and I've reduced it to 7. I'm still noticing the "pulsing" however from both PAS and manual throttle control.
BTW, everything was better with the 36v battery. I probably needed to adjust the settings a little bit, but they weren't bad (not nearly as bad as I'm noticing now, even after lowering the gains a TON).
Can anybody suggest some other parameter that I should tweak?
2nd Update: I just lowered the UpRate to 1.0 and the FastRate to 1.5. Still feel some surging when I'm using the torque-PAS. I'm able to hold a steady power level with the throttle now. However, I have "the worst of both worlds" instead of the best -- maxing out the throttle control doesn't seem to be enough to get things started (at least, not without a _long_ delay). If I peddle and PAS kicks in the motor power, however, the throttle then becomes instantly responsive and I can pretty much set whatever level I like and hold it there. It would be nice if I could just get a nice, smooth response while I peddle and only have to use the throttle when I'm climbing the big (15% slope) hill. Also, one other tidbit -- the upper watt limit that I set, 1000w, seems to be held pretty consistently. If I've maxed out the throttle, I notice the watt output stays really close to 1000 (maybe 980 or 990, then up to 1010 or 1020 most of the time). So I don't think the WGain is the reason I have the surging problem from the Torque-PAS. If there's any other information I can provide, or any settings I should try, please let me know.