Page Comparison

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 RemovedImage Added

• LED 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

  • try not to have light stick out

  • What direction is reference light pointing? How is the reference light set up so we can replicate? Jasmine to email

• Taillight must be visible 10 degrees from perpendicular, so might have to drap around the side of the car

  • Requires 2 boards if we need that

• 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?

    • DCDC

  • 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

  • Also ask if power select/power distribution can be powered with BMS at the start

  • Also ask if it can power UV cutoff

• 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?

  • Probably not, since we can recharge aux batt any time so energy density is not that big of a concern

• 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

  • Some mech stuff mech people have figured it out

• Mo has solar panels in CAD

  • To get cutout locations

  • To make the specific 3d layout

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

  • 2700W

  • Set regen level to be lower based on batter percentage

  • Set cutoff for high SOC

  • regen will have to be limited

• 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

  • Don’t know how the openings will work

• Do we want a button to control fan speed? Probably

  • To check if there are extra circuits on steering stalk

• Forest to order some comically long USB cables

  • to see if long able off digikey

  • Cam to dash is 4-5m depends on how much we route it around