ISA IVT-S

Introduction and miscellaneous that we haven't created categories for, yet
Post Reply
User avatar
Bigpie
Posts: 1586
Joined: Wed Apr 10, 2019 8:11 pm
Location: South Yorkshire, UK
Has thanked: 74 times
Been thanked: 299 times

ISA IVT-S

Post by Bigpie »

I've got one of these shunts fitted and reading current and ampseconds from it, the ampseconds are counting up as expected but not saved across resets, it's back down to 0 amp seconds for example.

https://www.isabellenhuetteusa.com/wp-c ... _V1.02.pdf The datasheet is difficult to read but says
"The log data are continually stored, with an interval of 15 minutes if the IVT-S is configured in run-mode.
In case of a sensor reset, the last stored logdata will be recovered."
Does anyone know if there's a way of storing the current measurements right before shutdown as to not lose up to 14 minutes and 59 seconds of usage measurements? STORE only mentions measurement configurations.
Screenshot 2022-01-08 at 6.09.23 pm.png
VW Beetle 2003
Outlander front generator
Prius Gen 3 inverter (EVBMW logic board)
Outlander charger
3x Golf GTE batteries
Chademo Charging
Outlander water heater
Isaac96
Posts: 656
Joined: Sat Oct 05, 2019 6:50 pm
Location: Northern California, USA
Been thanked: 1 time
Contact:

Re: ISA IVT-S

Post by Isaac96 »

Hmm this is quite a question. I thought the sensor always reset to zero, guess I'll have to rework my ISA-based SOC meter.

So you want to send a CAN message so that it saves the last ampsecond readings before shutdown. I don't see anything for that in the manual either, nor for the older ISA version (ISA-MOD).

Could you have an external device do the job? I've just learned about FRAM chips for nonvolatile storage -- one guaranteed 10 trillion write cycles. Then reset the shunt on powerup and tell all other modules what the 'offset' is relative to ISA.
User avatar
Bigpie
Posts: 1586
Joined: Wed Apr 10, 2019 8:11 pm
Location: South Yorkshire, UK
Has thanked: 74 times
Been thanked: 299 times

Re: ISA IVT-S

Post by Bigpie »

Mine always seems to reset to zero. Damien just used permanent 12v to power the shunt, tempted to just do that.
VW Beetle 2003
Outlander front generator
Prius Gen 3 inverter (EVBMW logic board)
Outlander charger
3x Golf GTE batteries
Chademo Charging
Outlander water heater
arber333
Posts: 3241
Joined: Mon Dec 24, 2018 1:37 pm
Location: Slovenia
Has thanked: 74 times
Been thanked: 223 times
Contact:

Re: ISA IVT-S

Post by arber333 »

Bigpie wrote: Sun Jan 09, 2022 8:28 am Mine always seems to reset to zero. Damien just used permanent 12v to power the shunt, tempted to just do that.
I would think SOC meter needs to always be powered on since there are elements leeching power even in standby.
Myself i am using EV Display and it is best to keep it permanently connected also to voltage measuring circuit. It has eeprom chip to save last SOC position in case of power out though...
It resets SOC to 100% when at charging highest voltage level is reached. Does ISA have a reset signal that we could command in CAN? Then it would be easy to set ISA to 100% everytime you fully charge the pack. Even with Chademo.
Any other consideration i am missing here?
User avatar
Bigpie
Posts: 1586
Joined: Wed Apr 10, 2019 8:11 pm
Location: South Yorkshire, UK
Has thanked: 74 times
Been thanked: 299 times

Re: ISA IVT-S

Post by Bigpie »

It does have a reset command. I'm currently using a button in my UI to reset the counter, but it resets back to 0 when it powers off anyway.

Code: Select all

void resetISACounters() {
  msg.id  = 0x411;
  msg.len = 8;
  msg.buf[0] = 0x3F;
  msg.buf[1] = 0x00;
  msg.buf[2] = 0x00;
  msg.buf[3] = 0x00;
  msg.buf[4] = 0x00;
  msg.buf[5] = 0x00;
  msg.buf[6] = 0x00;
  msg.buf[7] = 0x00;
  bmscan.write(msg, settings.veCanIndex);
}
I don't have anything connected to HV when the main contactors are open so shouldn't be any leeching.
I'm going to change the shunt to permanent 12v and have my charging code reset the counters to 0 and have my SOC be calculated based on 80% of the ah rating of the pack. I think that'll do for now.
VW Beetle 2003
Outlander front generator
Prius Gen 3 inverter (EVBMW logic board)
Outlander charger
3x Golf GTE batteries
Chademo Charging
Outlander water heater
User avatar
EV_Builder
Posts: 1199
Joined: Tue Apr 28, 2020 3:50 pm
Location: The Netherlands
Has thanked: 16 times
Been thanked: 33 times
Contact:

Re: ISA IVT-S

Post by EV_Builder »

Is there a DBC of these ISA devices?
Converting an Porsche Panamera
see http://www.wdrautomatisering.nl for bespoke BMS modules.
User avatar
catphish
Posts: 954
Joined: Fri Oct 08, 2021 11:02 pm
Location: Dorset, UK
Has thanked: 93 times
Been thanked: 179 times

Re: ISA IVT-S

Post by catphish »

EV_Builder wrote: Wed Sep 07, 2022 12:15 pm Is there a DBC of these ISA devices?
Here's one :)
Attachments
IVT-S_12082020.dbc
(37.51 KiB) Downloaded 54 times
User avatar
EV_Builder
Posts: 1199
Joined: Tue Apr 28, 2020 3:50 pm
Location: The Netherlands
Has thanked: 16 times
Been thanked: 33 times
Contact:

Re: ISA IVT-S

Post by EV_Builder »

are those messages correctly muxed? can't open it with CANdb++
Converting an Porsche Panamera
see http://www.wdrautomatisering.nl for bespoke BMS modules.
User avatar
catphish
Posts: 954
Joined: Fri Oct 08, 2021 11:02 pm
Location: Dorset, UK
Has thanked: 93 times
Been thanked: 179 times

Re: ISA IVT-S

Post by catphish »

EV_Builder wrote: Wed Sep 07, 2022 2:16 pm are those messages correctly muxed? can't open it with CANdb++
I use this file with SavvyCAN, afraid I can't speak for its compatibility with anything else, and I didn't make it.
User avatar
EV_Builder
Posts: 1199
Joined: Tue Apr 28, 2020 3:50 pm
Location: The Netherlands
Has thanked: 16 times
Been thanked: 33 times
Contact:

Re: ISA IVT-S

Post by EV_Builder »

ok no problemo will try to fix it.
Converting an Porsche Panamera
see http://www.wdrautomatisering.nl for bespoke BMS modules.
Post Reply