Provide a single series chain that de-energises the tractive system if any safety device opens.
Every shutdown device is wired in series: shutdown buttons, inertia switch, brake plausibility device, insulation monitoring device and the BMS fault output. Opening the chain anywhere drops the accumulator isolation relays. Design Philosophies and Processes: Inherited from the BSPD subsystem design process: 1. Establish the rules requirement and the thresholds from real vehicle data (brake pressure at which hard braking is unambiguous, throttle position of 10%). 2. Schematic capture in Altium, split into the main connector, reset subcircuit, signal loss subcircuit, simultaneous brake and throttle subcircuit, and the fault and latching subcircuit. 3. Lay out the board, push to MCAD, design the case. 4. Manufacture and bench test each subcircuit. 5. Validate on the car by observing PDM outputs: output 1 (ignition), output 11 (injectors), output 5 (fuel pump) all drop for the fault duration.
Contactors do not provide reliable state feedback. Without it the tractive system could remain energised while the shutdown circuit believes it is off. Mechanical wear or bounce can give inconsistent readings on budget contactors. Adding contactor AUX feedback is the identified fix and is needed to pass the tractive system master switch safety checks.
Nothing in CrimsonStorage covers these yet.