TCSP8Rel iab i l i ty and Safe ty Analys i s

ECE477 GROUP 4

CHRIS CADWALLADERCRAIG PILCHERANDY SYDELKOMIKE 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 Mode Possible Causes Failure Effect Detection Method Criticality

Unintended transmissions on CAN bus

Software errors Commands sent to host vehicle accidentally

Observable Medium – user dissatisfaction

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.

Observable High

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

Questions?