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titleMeeting Minutes 2023/09/20

Coulomb counting

  • Decided to go with on-vehicle SoC calc with max17261.pdf on current sense

    • CC by itself is not sufficient due to drift, algo needs to integrate vsense to anchor CC mesurements

    • Developing in-house SoC algo is difficult and unsure of what accuracy will be

  • Eric’s notes: https://uwmidsun.atlassian.net/l/cp/oPkT0eia

Solar Irradiance

  • Has theoretical power of one array using pysolar

  • Next steps:

    • Model all panels + effects of aero curvature

    • Obtain power for a given route

    • Add weather effects

    • Account for system efficiency over varying loads

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titleMeeting Minutes 2023/09/13

Coulomb counting

  • Found fuel guage IC that we might be able to use for main pack, a lot of FW complexity

  • Strategy algo progress basically 0

    • On-vehicle calc limits model complexity → lower accuracy

    • Unsure of resource usage on micro

  • Decision to be made next Tuesday on which method to pursue, to consider

    • FW effort of writing I2C driver for IC vs building in-house CC algo

    • Accuracy of OTS vs in-house

  • Forest to build 36x1 pack this weekend to support testing of CC + AFE

Telemetry

  • RF implementation is complex and involves dealing with FW drivers, regulations, and interference

    • Was initially proposed as a simpler alternative to dealing with networking protocols, but that doesn’t seem like it’s the case

  • From strat, we only need accurate SOC every 5 mins for their model, possible to do over radio

    • What accuracy is needed?

  • Baseline is no live data, will be a task but not on the critical path

    • Critical assumption made is that we will be able to get accurate SOC calculation entirely on the vehicle, which is possible especially with OTS ICs

Battery box board mounting

  • Started mounts, mostly done with carrier

  • To focus on AFEs since they are most complete

    • Backup is to use MSXIV AFEs, design mounts for those

  • To get current sense as close as possible to carrier

  • Figure out HV harnessing and where to place current sense

    • Should be on low side (connecting to neg pack terminal)

    • It is allowed to be before the main contactors as per regs section 8.6.A.4. Relays only need to disconnect HV wires exiting the pack.

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