TL;DR
A quick hardware overview of our Autonomous System Safety Board (2026_TT_AS_Safety), manufactured on AISLER’s 2-layer HASL Blitz service to handle low-voltage safety logic and RES bypass interlocks for Formula Student Autonomous Mode.
Overview
In Formula Student EV/DV, integrating autonomous capability requires strict, fail-safe hardware interlocks between the Shutdown Circuit (SDC), the Remote Emergency System (RES), and the Emergency Brake System (EBS). This board serves as the dedicated hardware interface ensuring our vehicle automatically switches between manual and autonomous safety loops.
Technical & Rule Compliance Details
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Fab Spec: 2-Layer 1.6mm HASL Blitz (AISLER Beautiful Boards).
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Reverse Polarity Protection: P-channel MOSFET protection circuit with TVS diode clamping on the
ASMS_INrail. -
RES Manual Bypass: Uses a forcibly guided safety relay. When the Autonomous System Master Switch (ASMS) is OFF (Manual Mode), the NC contacts automatically bypass the RES relay in the SDC. When ASMS is ON (Autonomous Mode), the relay energizes to route the SDC through the RES module.
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EBS Power Supply Interlock: Controls the
EBS_Supply_OUTrail using a high-current automotive relay driven directly by the SDC/AIR line (SDC_AIRS_IN). If the SDC opens for any reason, power to the EBS is cut instantly to trigger passive mechanical braking.
Fabrication & Assembly
Because safety interlock loops require high mechanical reliability, we kept this routing on a dedicated 2-layer board. AISLER’s HASL Blitz turnaround made it fast and effortless to produce and test during our low-voltage bring-up.
Drop a comment below if you have any questions on FS autonomous safety loops!