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by isaac_alaska1
Fri Mar 16, 2012 12:29 am
Forum: BMS thread
Topic: Old BMS General Thread
Replies: 658
Views: 1251437

Re: Old BMS General Thread

next step is to reconfigure the "interlocks" pin as an output to drive a digital pot in parallel with the throttle pot, so we can linearly taper the throttle back to zero throttle as the cells drop voltage.
by isaac_alaska1
Thu Mar 15, 2012 6:00 am
Forum: BMS thread
Topic: Old BMS General Thread
Replies: 658
Views: 1251437

Re: Old BMS General Thread

i found this! it's pretty sweet. i also found videos of the sled pull and the acceleration runs. http://www.youtube.com/watch?v=poVdxFoeack&feature=BFa&list=PL57F5BB9497F8EB4C&lf=plcp http://www.youtube.com/watch?v=-YQG54ZKW8g&feature=BFa&list=PLCD23D9FCC044B253&lf=plcp http:...
by isaac_alaska1
Sun Mar 11, 2012 3:32 am
Forum: BMS thread
Topic: Old BMS Software Thread
Replies: 600
Views: 1007879

Re: Old BMS Software Thread

Also! I have been invited to Greenland to demonstrate the machine at "summit camp". Our team took first overall in the electric category
by isaac_alaska1
Sun Mar 11, 2012 3:30 am
Forum: BMS thread
Topic: Old BMS Software Thread
Replies: 600
Views: 1007879

Re: Old BMS Software Thread

Great idea. I also want to implement more temp sensors. I'm looking at trying to do 72 of them, and read from a different sensor every time the program loops. (full pack reading in just over 1 minute) Also want to figure out how to monitor individual cells if a parallel fuse blows, but that's in the...
by isaac_alaska1
Sat Mar 10, 2012 11:54 am
Forum: BMS thread
Topic: Old BMS Software Thread
Replies: 600
Views: 1007879

Re: Old BMS Software Thread

Has there been any move to get the BMs to talk to the motor controller, perhaps via CAN? I know it's been mentioned but I don't know how all that works. That would push this to the next level. (of course, I'd need to get the current version working before beginning another journey ;) ) *edit* I gues...
by isaac_alaska1
Sat Mar 10, 2012 12:11 am
Forum: BMS thread
Topic: Old BMS Software Thread
Replies: 600
Views: 1007879

Re: Old BMS Software Thread

have been using the bms here at the "society of automotive engineers, clean snowmobile challenge 2012" on the electric snowmobile we put together. it's doing a great job so far, and in the range event it alerted us to shut down just when we needed it to. the abs min cutoff was set to 3.0 v...
by isaac_alaska1
Mon Feb 27, 2012 8:07 am
Forum: BMS thread
Topic: Old BMS Software Thread
Replies: 600
Views: 1007879

Re: Old BMS Software Thread

Here's the software i'm running, the load commands don't seem to be working like i expect them to. it works with the old pic, but i can't figure out why it's not working with the new pic. with the original pic, i can send command five to decrease cut in voltage, and then send command three to turn o...
by isaac_alaska1
Mon Feb 27, 2012 4:54 am
Forum: BMS thread
Topic: Old BMS Software Thread
Replies: 600
Views: 1007879

Re: Old BMS Software Thread

back again ;) my load cut-in doesn't seem to be working. i've set the cutin voltage to 4.1 in the master and slave software, as shown below. The there's several cells at 4.12 volts, but the load leds are not coming on. i tried sending command 5 three times, but that didn't engage any of the loads ei...
by isaac_alaska1
Sun Feb 26, 2012 8:40 am
Forum: BMS thread
Topic: Old BMS Software Thread
Replies: 600
Views: 1007879

Re: Old BMS Software Thread

Here's the latest, i guess this video doesn't have a whole lot to show about the BMS but it does show the vehicle a bit. And without the bms, the vehicle wouldn't be possible! now i just need a charger than can charge more than 5 amps....might be time to collect up some server power supplies. http:/...
by isaac_alaska1
Fri Feb 24, 2012 7:14 pm
Forum: BMS thread
Topic: Old BMS Software Thread
Replies: 600
Views: 1007879

Re: Old BMS Software Thread

This is the code we are using. the display looks really nice with it now. just gotta figure out how to make the opto outputs stay toggled. edit* oops i forgot to actually stick the link in here. here it is https://rapidshare.com/files/2288336884/isaac_MASTER_V31_191211_185V_PB3_PIC18F2680.pbp" oncli...

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