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Transcript
TEAM BRIGHTRIDERS “We put the SOUL in SOULAR racing” Failure Modes, Effects, and Criticality Analysis Power Circuits Power Circuits Failure No. Failure Mode Possible Causes Failure Effects Method of Detection Criticality A1 VDD5v = 0v Switching regulator circuit component failures, internal or external shorts, under voltage or disconnect on voltage supply line Telemetry System cannot operate. Observation High A2 0v < VDD5v < 4.2v Switching regulator circuit component failures, internal or external shorts, under voltage on supply line Microcontroller has an under-spec voltage supply for the operating frequency. The Telemetry System may not operate. Observation High A3 4.2v < VDD5v < 4.5v Switching regulator circuit component failures, internal or external shorts, under voltage on supply line RS232 Tranciever and CAN Tranciever under voltage spec and may not operate, Accelerometer out of calibrated range. Observation High A4 VDD5v > 5.5v Switching regulator circuit component failures, internal or external shorts, over-voltage on supply line All 5 volt components are over voltage spec, possible hardware damage, excess heating or failure to operate. Observation High Remarks Power Circuits Failure No. Failure Mode Possible Causes Failure Effects Method of Detection Criticality B1 VDD3.3v = 0v Linear regulator failure, internal or external shorts, under voltage or disconnect on VDD5v SPI-to-UART chips cannot operate, Telemetry system will be unable to communicate with the Battery, Motor, and GPS. Observation High B2 0v < VDD3.3v < 3.0v Linear regulator failure, internal or external shorts, under voltage on VDD5v SPI-to-UART chips are under voltage spec, Telemetry system may be unable to communicate with the Battery, Motor, and GPS. Observation High B3 VDD3.3v > 3.6v Linear regulator failure, internal or external shorts, over-voltage on VDD5v SPI-to-UART chips are over voltage, Telemetry system may be unable to communicate with the Battery, Motor, and GPS, as well as possible hardware damage and excess heating. Observation High Remarks SPI-to-UART and RS-232 circuits SPI-to-UART and RS-232 circuits Failure No. Failure Mode Possible Causes Failure Effects Method of Detection C1 No data received by chase car C2 Failure to enter diagnostic mode Criticality Packet modem out of range or unoperational, UART module of microcontroller unable to transmit, RS232 transceiver failure, software bug The Telemetry System is unoperational. Observation High Packet modem out of range or unoperational, UART module of microcontroller unable to receive, RS232 transceiver failure, software bug Diagnostic mode is unavailable, but the major part of the Telemetry System is functional. Observation Low Remarks SPI-to-UART and RS-232 circuits Failure No. Failure Mode Possible Causes Failure Effects Method of Detection Criticality D1 Invalid or missing data from Battery SPI-to-UART chip failure, SPI-to-UART chip select stuck high or low, crystal circuit failure, RS232 transceiver failure, SPI module of microcontroller failure, cable disconnect, software bug Driver unable to read and manage battery levels. Possible battery over-charge. Communicati on tested during selftest High D2 Invalid or missing data from Motor SPI-to-UART chip failure, SPI-to-UART chip select stuck high or low, crystal circuit failure, RS232 transceiver failure, SPI module of microcontroller failure, cable disconnect, software bug Unable to log motor data for performance analysis. Communicati on tested during selftest Low D3 Invalid or missing data from GPS SPI-to-UART chip failure, SPI-to-UART chip select stuck high or low, crystal circuit failure, RS232 transceiver failure, SPI module of microcontroller failure, cable disconnect, software bug Unable to log GPS data for aerodynamic analysis. Communicati on tested during selftest Low Remarks Analog Circuits Analog Circuits Failure No. Failure Mode Possible Causes Failure Effects Method of Detection Criticality E1 Invalid or missing data from Acceleromete rs Accelerometer failure, A/D module of microcontroller failure, improper alignment of telemetry system, software bug. Unable to log acceleration data for aerodynamic analysis. Operation and validity tested during self-test Low E2 Invalid or missing data from Temperature Sensor Temperature sensor failure, A/D module of microcontroller failure, software bug. Unable to log internal car temperature for analysis. Operation and validity tested during self-test Low Remarks Microcontroller and CAN circuits Microcontroller and CAN circuits Failure No. F1 Failure Mode Microcontroller does not operate Possible Causes Bypass capacitor failure, crystal circuit failure, microcontroller failure, power circuit failure, software bug Failure Effects Method of Detection The Telemetry System is unoperational. Observation Criticality High Remarks Microcontroller and CAN circuits Failure No. Failure Mode Possible Causes Failure Effects Method of Detection Criticality G1 CAN module cannot transmit CAN transceiver failure, CAN module failure on microcontroller, power circuit failure, cable disconnect, software bug. Driver interface unable to update. Driver unable to read and manage battery levels. Possible battery over-charge. Communicati on tested during self-test High G2 CAN module cannot receive CAN transceiver failure, CAN module failure on microcontroller, power circuit failure, cable disconnect, software bug. Unable to log maximum power point tracker data for performance analysis. Communicati on tested during self-test Low Remarks