Transcript Document

TEAM BOAR
P h i l l i p B ye r s
J o n a t h a n M u l va i n e
Josh Schortgen
Michael Broski
PSSC’S
1. An ability measure internal temperature of two separate
points in the meat and the temperature inside the roaster
using RTD sensors.
2. An ability to control the temperature inside the cooker by
modifying gas flow using a logic controlled valve .
3. An ability store and load cooking profiles from memory.
4. An ability to automatically ignite at the push of a button and
detect whether a flame is present.
5. An ability to wirelessly communicate temperature
information to a remote display device.
RELIABILIT Y AND SAFET Y
COMPONENT CHOICES FOR ANALYSIS
 Component choices:
 Micro
 Most complicated
 3V power MOSFET
 High heat
 5V power MOSFET
 High heat
 XBEE
 Complex, RF, 50mA
 Relay
 Physical wear
MICROPROCESSOR BLOCK
 PLL and oscillator circuits included
 Includes all pin failures
POWER SUPPLY BLOCK
 Includes both 3V and 5V MOSFETs
 Includes passive components
 Includes transformer (not shown)
 (ignore orientation of 5V reg)
GAS REGULATION BLOCK




Includes
Includes
Includes
Includes
some port pin signals
MOSFET
relay
resistors
FMECA
gas supply
failure
failure mode
gas open when not
commanded
User detects smell or
solenoid open and valve
burner stays burning,
observes high
not closing (pin
processor, mosfet, relay, burns at maximum or
temperature or remote
controlled)
motor, solenoid failure gas is released unburnt alerts user
high
gas closed when not
commanded
processor, mosfet, relay,
motor, solenoid failure or
solenoid closed or valve no supplied gas or loss of
closed
120VAC
no heat produced
screen malfunction
screen blank, dark,
garbled, or static
sensor input out of
range or inaccurate
one of 3 sensors
input signal out of range, resistor, RTD, capacitor, useless, registered
low, or high
ATD, or SPI failure
temperature low/high
sensor input out of
range or inaccurate
input signal out of range, resistor, thermistor, or
low, or high
port failure
display
temperature
measurement
possible cause
contrast not set, failure
of micro, digital POTS,
cable, or power
failure effects
method of detection
normal use interrupted
or remote alerts user low
unit rendered inoperable observation
gas may stay on in
absence of flame, grill
may not light
criticality
low
calibration proceedure
or meaningless
temperature observed low
grill automatically
closes gas after
ignition, smell
high
QUESTIONS?
 Why some component was not chosen?
 Our ideas for safer failure?
QUESTIONS?