openinverter forum

Jack Bauer wrote: ↑Tue Jul 28, 2020 6:35 am So I want OUT3 to activate when hv is required and de activate when charging finishes. Yeah I've changed a few things around on this design but no need to worry about that right now. We'll just get it running on the leaf vcu then can adapt.

Isaac96 wrote: ↑Fri Jul 31, 2020 6:31 pm CHAdeMO VCU from Damien arrived today! Thank you so much!!!

I'll have it wired up in an hour or so and go try it out (just waiting on ISA shunt, that should be here soon enough).
At least I can see how CAN works and whether I set up the I/O correctly.

HV request - that will be in the next version after I've verified correct operation.

-Isaac

mfox wrote: ↑Fri Aug 07, 2020 2:27 pm This is great . I also want to make chademo on my BMW.
Max system voltage is 220V .

Isaac96 wrote: ↑Fri Aug 07, 2020 7:06 pm Buck charging is a possibility. Official spec requires operation down to 125v, and iirc Damien charged a 144v pack a while back? It seems to depend on the charger.

IanG wrote: ↑Mon Aug 17, 2020 4:24 pm Hi All,

Amazing collaboration going on here. I have been lurking on this thread for the last couple of months and I would like to volunteer as a beta tester?

I have been wanting to fit CHAdeMO to my race bike (s) and have a 10kW single phase portable CHAdeMO charger ready to go. I built the battery with an ISA IVT-MOD fitted, as well as the additional contactors. I just need to mount the receptacle somewhere.

I've been thinking about the integration with BMS and other vehicle safety systems. Looking at the code (I am not a software guy but I do write pseudo code/ flow diagrams in control schemes occasionally) with the max V hard coded and the activate/deactivate appears to occur as the controller is powered up and the CHAdeMO charger is connected?

From this it looks as through the BMS needs to interrupt the 12V supply if the battery gets hot of some other issue occurs? Or have I missed some important point?

Also, on the schematic, R69 120R resistor for CAN termination, shouldn't this short between pin 6 and 7 on IC3? At the moment it just seems to siting parallel on Pin 6.

Great job and I can't wait to buy a demo board.

IanG wrote: ↑Tue Aug 18, 2020 6:07 pm OK, Cool, makes a lots of sense, getting the charger to respond reliably and consistently is going to be the biggest challenge.

I think a single I/O (Go/No Go) from the BMS is all the feedback that is necessary at this point.

arber333 wrote: ↑Tue Aug 18, 2020 6:28 pm A question if I may regarding of current sensor.
Could we use an analog 5V hall current sensor with leaf VCU? I have two LEM automotive sensors here. One from Ampera battery and the second is similar. Also I have a bunch of different 5V Tamura sensors from different projects.

It's just to cover all bases.

Tnx

A

celeron55 wrote: ↑Tue Aug 18, 2020 8:23 pm It's actually not 100% necessary to measure current to get chademo working, as it's not transmitted to the charger. Goes against the spec I guess, but still. The charger will tell you what current it's putting out.

Same applies for voltage, but that's going into "how to make your batteries explode" territory.

The ISA shunt is really handy for both current AND voltage measurement, but customization allows getting rid of extra components. Personally I get my chademo charge voltage measurement from the Leaf inverter on canbus, in addition to my bms.

Isaac96 wrote: ↑Tue Aug 18, 2020 8:47 pm That should work, using the throttle input on Leaf VCU. However you'd need to edit the code quite a bit -- I'm considering abstracting away the I/O from the main code, to support different sensors. Might also need to add amphour counting functionality, which is another layer of annoyance.
Also not sure how good the resolution will be.

-Isaac

arber333 wrote: ↑Tue Aug 18, 2020 9:24 pm Ok great!
Usually different sensos use different mV/A maybe that should be one variable that we will have to set.
So i propose to add three variables. We do have a settings interface dont we?
1. is it a CAN msg sensor or analog 5V?
2. if analog, what is the mV/A ratio?
3. What is the sensor 0A reading? Some centers may read 0A at 2.5V some at 2V or some at 3V...

Resolution should be to tenth of A. With Chademo charging at 50A mistake of 1A means very little voltage rise on battery. What is the resolution on chademo station side?
I think we should use up to 200A sensors anyway.

Isaac96 wrote: ↑Tue Aug 18, 2020 9:46 pm CHAdeMO current readings are accurate to 1A, so no more than that is needed. 200A is a good limit for CHAdeMO only, though of course more is needed if one wishes to use the sensor for general instrumentation.
Resolution should be good with a +-200A range over 12 bits - that should be accurate to about 0.1A.

However, I'd like to hold off on the additional sensors until the original setup works -- glad to add more functionality at that point, but adding more to the code is a recipe for confusion when debugging.

-Isaac