User guide
E-scooter functional safety engineering: safety integrity as the sixth cross-cutting infrastructure axis — IEC 61508:2010 (E/E/PE safety-related systems, SIL 1-4) + ISO 26262:2018 (automotive FuSa, ASIL A-D) + ISO 13849-1:2023 (safety-related parts of machinery, PLr a-e, Cat B/1/2/3/4) + IEC 62061:2021 (SIL CL for machinery E/E/PES) + EN 17128:2020 Annex G (PLEV functional safety requirements) + IEC 60812:2018 FMEA + IEC 61025:2006 FTA + IEC 61709:2017 reliability data + MISRA C:2023 software safety subset + ISO/PAS 21448:2022 SOTIF + IEC 61511 process industry + IEC 60730-1:2024 controls + UL 991 + UL 1998 + DO-178C analogy
Engineering deep-dive into e-scooter functional safety as the sixth cross-cutting infrastructure axis — parallel to [fastener/joining](@/guide/fastener-and-bolted-joint-engineering.md), [thermal management/heat-dissipation](@/guide/thermal-management-engineering.md), [EMC/EMI/interference-mitigation](@/guide/emc-emi-engineering.md), [cybersecurity/interconnect-trust](@/guide/cybersecurity-engineering.md), and [NVH/acoustic-vibration-emission](@/guide/nvh-engineering.md). Covers: 10-row standards matrix (IEC 61508, ISO 26262, ISO 13849-1, IEC 62061, EN 17128 Annex G, IEC 60812 FMEA, IEC 61025 FTA, IEC 61709, MISRA C, ISO/PAS 21448 SOTIF); SIL/ASIL/PL/SIL CL cross-mapping; 6-row hazard-by-subsystem matrix (motor controller throttle-stuck, brake actuator loss, throttle position drift, BMS thermal runaway, display HMI critical info, lighting fail-dark); FMEA worked example for BLE throttle injection scenario; FTA worked example for wheel lock at speed; FMEDA with PFD/PFH calculation, Safe Failure Fraction, Hardware Fault Tolerance; risk reduction equation R_residual = R_unmitigated × (1 - RRF); 6-row mitigation matrix; ALARP principle; software safety V-model + MISRA C:2023 + formal methods; SOTIF (ISO/PAS 21448) as extension to IEC 61508; HIL testing + fault injection; 8-row real-incidents timeline (Lime brake recall 2019, Ninebot ES2 throttle creep 2020, Apollo Pro firmware bug, Boosted board fire, Bird scooter rear-wheel hub crack, Tier scooter motor-stuck); 8-step DIY safety check; 6-step DIY remediation; industry shift 2020→2026; 16 numbered sections.