关键词: 智能门锁, 功能安全, 故障注入, 电子控制器

Abstract: The functional safety of the electronic controller for smart locks is the core of ensuring home security. To identify and address the abnormal unlocking risks caused by hardware failures, a standard based fault injection method is adopted to conduct systematic analysis of typical controller architectures. The experiment focuses on the failure response of the level control interface and identifies the signal path between the MCU and the driver chip as the key weak link. A collaborative protection mechanism that integrates hardware timing management and software pre-action diagnosis has been designed and implemented for this link. The verification results indicate that this mechanism can effectively prevent dangerous failures caused by input signal tampering, and transform immediate risks into controllable anomalies. The research provides a complete research path from risk analysis, experimental verification to protection design for smart lock controllers, which has effective reference value for industrial practice and standard improvement.

Key words: Smart lock, Functional safety, Fault injection, Electronic controller