Participants: Former user (Deleted) Mohamed Goha Jonathan Xie Yanshen Zhou Jasmine Thind Jenna Kong Owen Li Kostubh Agarwal Nicole Choe Shem Kim Objective: sync discussion on: lights, power startup sequence, brakes, steering Lights: Current enclosure is designed based on MSXVI  Image Removed Image AddedLED board is in the YZ plane (if x the front-back axis of the car) Might have optics to focus the light more ENture surface is thermoformed over so light gaps can be as large as needed Todo get reference lights if we don’t already have How to get lighting requirements for side repeater? 5 degrees from body side Taillight must be visible 10 degrees from perpendicular, so might have to drap around the side of the car Confirmed will combine rear brake and turn To figure out mounting for center brake light and BPS strobe No combined turn/brake One LED driver for both side DRLs One driver per turn signal side One driver for all 3 brake One driver for BPS Total 5
Combined turn/brake One LED driver for both side DRLs One driver per turn signal side one driver per brake light one for BPS Total 7
Mostly todo: clarify reference
Whats the turn on process for the car? Person closes main control switch Aux batt is connected to main relays (2 of them) Aux batt directly connects to HV contactor switch, which you close How do we power BMS from aux battery and then switch the power source? What are we checking? Voltage and temperature and current? When we close the contactors, what gets connected? Power BMS first to run self check
How does BMS disconnect the pack if its connected to the Can we email the people to ask if BMS can be powered for a few seconds after Talk to Mitch UV cutoff is active protection as defined by 8.3.A.5, which is no protection when there is no power. Do we need to add passive protection? Should we use primary cell for aux? Owen to get back to jonathan about cutoff voltage Aux battery will last at least one day, @Forest to see if thats is still true 5Ah @ 12V, 60Wh, total driving time is 9 hours aux battery power consumption has to be less than 6W Loads: 3.5W contactors, 1W for driver fan, Telemetry 2.5W, horn 0W which is 7W To check regs if we can swap aux batteries whenever
There is CAD for the battery box, Mo is working on main assembly Do we have thermal load for battery box Allows us to reduce the LV power, BMS fans is the single largest LV load Fans are part of the air duct that goes to the wheel
To send battery box with battery if that wasnt sent already have searate battery box elec fw sync to talk about BMS architecture and general elec stuff in box mo working on assembled CAD model to come next week (to get git to work properly as well)
Solar Panel covering Nothing gets put on them The roof will have indents for where the panels will sit, everything will the flush Mo has solar panels in CAD
How does regen braking work? one pedal driving? Jonathan to figure out how to deletect brake press and what it should connect to we need button to turn poff regen for brake testing No throttle is full braking Full pedal is full power to adjust gradient in testing Battery max charge current is 0.7c, 27A max charge current Test regen efficiency on dyno when we get that working Jonathan to figure out how much braking is 2700W Wheel weels have not been designed Do we want a button to control fan speed? Probably Forest to order some comically long USB cables
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