SRR Notes

Data Acq

What they are?

Sensors

Current
- Perif Dotter board
  - som
- Adding "bunch of sensors" to make better system
IMU
Airflow
Temp sensor
TPMS

Telemetry

Mechancial will use this post race to inform new decisions
CarCan Frequencies
- 10hz and 5hz for regen
- only regen new
- want more data to be able to make better ML models
New sensors
- They have a lot of sensors with a lot of different frequencies
- these are all the sensors that they are adding
- not as fast, just as needed for the data tracking
Dash informaiton
- Will display new info every 2Hz
- I missed this all tbh
Race Strat
- Optimizing performance on race day
- Outputing optimal speeds ever 3 seconds
- modeling when we should be stopping the car for pitstops
- Car modeling
  - Lots of sensor data
- Time steps 1ms (interpolated)
  - road and weather related (again went through this really fast and really interpreted nothing
- Importing data and do ml(?)
- Live data intorpolated in 1sec introvals
- output time every 3
- WTF I DIDNT EVEN READ IT YET
- ASC pit stops is where this shines
  - Figuing out how to optimize pit stops for the ASC race where we already have set pitstops

Q&A

Controls get brake pot data first (for regen)
Do you know the power draw?
- Mihgt want to ensure that there isn't too much power being taken to maintain all of these
Pressure sensor for down force? Where and why?
- Back of car
- You should do multiple sensors to do a pressure differenctial
Telmetry do we have to send things at real time?
- Doesn't have to be sent in real time
- Has its own CAN so not worried about putting too much load on a single can system
Why only one reading per min?
- Good to have but just didn't think it was needed to be faster
Is there a link between huminidy and bat performance?
- Yes there was things online about it
Did you look into other solvers for ODEs? (Solving for simulation)
- they have done thier own calls using genetic algos where we get array of speeds before hand
- more happened I missed this
Might want to look into sensors before going into this early to ensure that the CAN bus isn't overrun?
- I^2C
- Dont do conversions

Controls:

M3 Focus

New Features

Motor display and itnerior
- Next gen will have updated regne and gear
- 2 wheel drive
- Distributes friction
- Have you considered the fact that the two wheels go at different rates ie we would have to do diff math?
Cruse control
- Updating ease of use by doing more things
Acceleration, one pedal mode
- currently
  - Regen, const, accel are all just in zones and are hard limits
- New
  - Taking pots and changing regen on any time its released (didn't tell me about the other stuff IE how you would stay at a const speed)
Display mods
- Currently a static page, no nav/ controls
- New
  - Multiple pages
  - driver navs the three modes
  - adding blind spot detection
  - Will swap to error screen when there are errors (bad IMO)
Steering
- Trying to add more buttons onto the steering wheel
- also wants switches on steering wheel
Cooling
- Adding apot to change fan speed (wasnt I told that was bad cuz it uses same amount of power at all times)
Board mods
- Moving to SOM (System on a model)
- Modular and easy manufacturing and create uniformity
- Will create more shielded info since its convered
Display modifications
- Programable
- UART for com
- low power consumption (should try to put a number on this)
- STM32 MCU
- Same or larger

Q&A

What is blind spot monitoring
- checking with a distance sensor
Where is display located and sash located
- Dispaly is to the right
Dispalys all look like hats that would require some wiring since ts being used in a way they arent intended for?
how is the one pedel mode worse than the new way?
- Most pedals use the newer way and WE think that the new way is more intuitive
Are we looking into other ways/better

Power Gen SRR

we have better commercially available solar cells
- Mppt has to change if we want to use COTS parts
Swapping from Gen 2/3 to 6/7
- 2/3 are at End of life so they are more expensive now
- 6/7 are easier to manufacture in theory and larger
  - Change in size will up voltage and require changes to MPPT
Changes
- Up from 125 to 166mm
- they up the currents which will require MPPT to have bigger inductors and conductors
Telemetry changes
- Black body A (array temp and irradience sensors)
- Uses spi to read with the MISO and MOSI lines are flipped and its causing them to have to use software to fix it
- simplifying Blackbody A to a single RTD chip from 8 and a decoder
- Choses which RDT to turn on

Q&A

Power System

wants a power board redesign to avoid logic ops at 12v
High current draw in fault state
HV design
- Charging efficiency from the batteries an arrays ( Batter temp >45)
They think that if they dual charge they could charge more
They seem to not fully understand how this was designed in the past (AKA since they didn't design it they dontn know it all)
Thinks they can optimize things by using a board instead of as buttons
Battery pack concerns
- Brained wires are exposed and stuff
- solder joints are unreliable and prone to failure
- voltage taps and thermistors are really messy
- Overall seem to be on moudulatey and cost over efficiency and safety
  - Should talk to the ppl who design this in the past
- Wants to find better ways to connect the wires
Cell manufacturing (Why are we characterizing all of the cells? Like what is the purpose/benefit)
- Takes a long time since they are wanting to check and characterize each and every cell
  - would take over a year
- New plan is to do batch testing in boxes
- current charging and balancing is janky/unsafe so they are planning on making a PCB that can just do the testing on its own
- Just checking to see how close they are to eachohter
Ignition switch
- Unnecessary transfer of signal to and from the same boards which adds to potential points of failure

Q&A