Imported from GitHub: michaelruppe/FSAE · commit 3afdc0a · license MIT

Description

Projects for Formula SAE Electric Vehicle competition (Australia 2019/2020)

README

Warning: This design was never physically prototyped. As-is it is a mostly-complete design, but has never been through build, commissioning, troubleshooting. Proceed at your own risk.

Hard Fault Latch

A shutdown-circuit component.

The Hard Fault Latch (HFL) is a device that breaks the Shutdown Circuit when a Hard Fault is detected. These are faults generated by the IMD, BMS, BSPD PDOC-temperature, and BOTS. A Hard Fault is any fault that will deactivate the Tractive System, and cannot be reset by the driver. The HFL is built upon relay-logic because it is easy to understand, reliable and hardened against noise and voltage transients.

An operator must press the HFR button each time the vehicle is powered-on, before the Tractive System can be activated.

Additionally, the HFL passes hard-fault statuses for the IMD, BMS, BSPD and PDOC (not BOTS) to the CCU for logging and dash-display.

Technical Specifications

ToDo

Design Justification

The final output relay must be capable of carrying sufficient current to power an AIR, and be a DPDT type. The smallest readily-available relay found was an OMRON G2R which is rated for 5A.