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Ford/Lincoln CompanyECEN 4610
Preliminary Design ReviewJanuary 28, 2003
Oliver Mansour, Dan Spendley, Davy Odom, Lincoln Ritchie, Kelli
Settell
PurposeWork in collaboration with a team of mechanical engineers on an existing project to increase signal clarity and redesign system components to improve performance and reduce cost.
Performance Feel Project
Neeraj GuptaDonald StricklandSanjeev Sharma
Taylor RyanAaron Aikin
Professor Jack Zable
University of Colorado at Boulder
Senior Design Project
Overall Project ObjectivesDesign and develop a system to obtain data relating to performance feel.Develop a mathematical model to relate the physical data measurements to the customer’s perception of performance feel.
EE Project Objectives• Eliminate noise • Condense the overall system by
replacing existing components • Add calibration process• Possible RF interface for data
transmission
Lab Test ResultsAccelerometer X-direction
-6
-4
-2
0
2
4
6
15 20 25 30 35 40
Time (s)
Acc
eler
atio
n (
g)
Accelerometer Y-direction
-8
-6
-4
-2
0
2
4
6
8
15 20 25 30 35 40
Time (s)
Acc
eler
atio
n (
g)
Accelerometer Z-direction
-8
-6
-4
-2
0
2
4
6
15 20 25 30 35 40
Time (s)
Acc
eler
atio
n (
g)
String Potentiometer
012345678
15 20 25 30 35 40
Time (s)
Dis
pla
cem
ent
(in
)
Db Meter
-1
0
1
2
3
4
5
6
0 10 20 30 40 50
Time (s)
(no
t ye
t ca
lib
rate
d)
Physical Test ResultsAccelerometer ( X -dir )
-15
-10
-5
0
5
10
15
0 5 10 15 20 25
Time
Acc
eler
atio
n (g
)
Accelerometer ( Y-dir )
-1.5
-1
-0.5
0
0.5
1
1.5
2
0 5 10 15 20 25
TimeA
ccel
erat
ion
(g)
Accelerometer ( Z -dir )
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
0 5 10 15 20 25
Time
Acc
eler
atio
n (g
)
String Potentiometer
-8
-6
-4
-2
0
2
4
6
8
0 5 10 15 20 25
Time
Po
siti
on
(in
)
dB Meter
-10
-5
0
5
10
15
20
0 5 10 15 20 25
Time
(no
t ye
t ca
lib
rate
d)
12 V DC SUPPLY FROM CAR
DC INVERTER300W, 110V AC
SIG. COND. -1130 W, 110 V AC
SIG. COND. -2130 W, 110 V AC
ACCELEROMETERS (4)
LAPTOP WITH DAQ CARD.
dB SENSOR
STRING POT. FOR PEDAL DISP.
9 V DC BATTERYLOAD CELL FOR
PEDAL FORCE
TACHOMETER
CONTROLLER BOX
Schematic for System
Constant Voltage/Current Source
68H712Micro-
processor
Outline of Approach• Deadlines from other group make
some tasks have priority over others
• Solution- Divide project into two parts
First Task: Clean Up Existing Data Signals
• Test current system for noise source(s)
• Reduce noise in system:– Using necessary wiring and shielding
techniques– Implementing noise filters
Second Task: Design and Develop New Component System:Signal/Power Conditioner
• Design and build constant current and voltage source to run sensor devices– Load cell, constant current– Accelerometer, constant voltage
• Localized signal conditioning– Implement hardware filtering– Signal amplification
Second Task: Design and Develop New Component System:
Controller
• Design and build controller box– Use “micro-processor” (Motorola 68H712?) – Provide brains for calibration– Eliminate need for DAQ card
• Localized data storage• Communication through serial port/RF
link
Design AlternativesInvestigate different micro-processor optionsUse varying amounts of hardware and software filtering
12 V DC SUPPLY FROM CAR
DC INVERTER300W, 110V AC
SIG. COND. -1130 W, 110 V AC
SIG. COND. -2130 W, 110 V AC
ACCELEROMETERS (4)
LAPTOP WITH DAQ CARD.
dB SENSOR
STRING POT. FOR PEDAL DISP.
9 V DC BATTERYLOAD CELL FOR
PEDAL FORCE
TACHOMETER
CONTROLLER BOX
Schematic for System
Constant Voltage/Current Source
68H712Micro-
processor
Constant Current and Voltage Source
Voltage and CurrentSource
12V Power Supply
Voltage to Accelerometers Signals from Accelerometers
Current to Load Cell Signal From Load Cell
Signals to Controller Box
12 V DC SUPPLY FROM CAR
DC INVERTER300W, 110V AC
SIG. COND. -1130 W, 110 V AC
SIG. COND. -2130 W, 110 V AC
ACCELEROMETERS (4)
LAPTOP WITH DAQ CARD.
dB SENSOR
STRING POT. FOR PEDAL DISP.
9 V DC BATTERYLOAD CELL FOR
PEDAL FORCE
TACHOMETER
CONTROLLER BOX
Schematic for System
Constant Voltage/Current Source
68H712Micro-
processor
Controller Box
Controller Box
Signals from Sensors / Conditioner
Calibration Test Signals
Calibration Test Data
Serial Output for Data Transmission(RF Link?)
Design Risks
Unfamiliarity with component abilities and limitationsLimited experience in troubleshooting existing systems
Division of Labor• Clean existing signals
– Entire team, to familiarize with the current ME system
– Due to deadline requirements by ME team
• Processor– Davy, Oliver, Dan
• Signal Conditioner– Kelli, Lincoln, Dan
Project Schedule
Project CostItem Vendor Model # Cost
3-axis Accelerometer PCB Peizotronics UT356A15 250.001-axis Accelerometer PCB Peizotronics U352B10 600.00Tachometer Industrial Process Measurements Inc. ACT-1B/12 450.00String Potentiometer Space Age Control 173 240.00dB Meter Extech Instruments 407706 35.00Load Cell Futek L16010 375.00Signal Conditioner PCB Peizotronics 48A22 325.00Data Acquisition Card (DAQ) National Instruments DAQCard-AI-16E-4 450.00Power Inverter General Electric AV93641 60.00Laptop Hewlett Packard Omnibook 900 NAConnector Box National Instruments SCB-68 295.00Microprocessor Motorola 68H712 15.00Miscellaneous ? ? < 50.00Total Amount Saved: >$1065.00
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