TCSP8 Reliability and Safety Analysis ECE477 GROUP 4 CHRIS CADWALLADER CRAIG PILCHER ANDY SYDELKO MIKE WILLIAMS Project Forget-Me-Not

Reliability and Safety Concerns False negative – Child present, but not detected  Could lead to physical harm or death Unintended manipulation of host vehicle  Undesired CAN trasmissions Component failure due to excessive heat  Overuse of the audio amplifier

Components Likely to Fail Freescale 9S12DP256C– High complexity microcontroller TAS5710 – Audio amplifier  Mounted upright, no heatsink LM5705 – Linear regulator  Majority source of heat Linx tranciever – Wireless module

Mitigation of Safety and Reliability Issues Failure ModePossible CausesFailure EffectDetection MethodCriticality Unintended transmissions on CAN bus Software errorsCommands sent to host vehicle accidentally ObservableMedium – user dissatisfactio n No communication between remove and base station Failure of a linx module or one of the encoder/decoder chips Unable to detect child presence or removal. ObservableHigh Vcc short to ground Failure of the linear regulator Excessive heat and current. Possible source of fire. Observation; heat and smoke likely. High Loss of communication on CAN bus Failure of the high speed or single wire CAN tranceivers Inability to issue commands to the host vehicle Measureable: Absence of traffic on the CAN lines. High

Mitigation of Safety and Reliability Issues Proper de-rating of components to increase reliability Additional measures or handshaking to prevent child side detection misses due to RF interference. Conservative use of the audio amplifier Determine a detection method for failure of the RF interface

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