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A power distribution board is necessary to supply power to the various subsystems in the vehicle. This board performs distribution, startup, shutdown and emergency shutdown as required in regulations. In addition to supporting powering the boards, it also powers components directly, such as the horn, camera and others.
Requirements
| # | Title | User Story | Importance | Note |
|---|---|---|---|---|
| 1 | DC-DC |
| Must have | |
| 2 | Thermal Control |
| Must have | |
| 3 | Rear Power Distribution |
| Must have | |
| 4 | Front Power Distribution |
| Must have | |
| 5 | Aux Charger |
| Not urgent | |
| 6 | Protection |
| Must have |
Power State
It is best to imagine there are two state the power distribution boards can be in, one for car start up/emergency stop, and one for drive.
During start up or emergency stop the car's LV(low voltage) systems is powered off of an auxiliary battery, in this state only some system are allowed to be powered ie: BMS, rear light, and driver control. Only a limited system are allowed to be powered is to reduce power loss on the aux battery. Note that in this state the main battery relay are open, meaning that no HV(high voltage) devices are operating.
During drive the car's LV systems is powered off of DC-DC, in this state all system are powered.
Power Path Select
[Under construction]
Firmware
On MSXIV power distribution there are some big changes which include t