Transcript System for Engine Location Of a Web Train

System for Engine Location Of
a Web Train
Paul Wimmer and Adam Weintrop
Dr. Irwin and Dr. Schertz
11/14/05
Outline
• Current position on time line
• Accomplishments of week 3
• Goals for week 4
2
Time Line
3
Outline
• Current position on time line
• Accomplishments of week 3
• Goals for week 4
4
Week 3
• Scoped track and found out voltage was
wrong
• Realized track power supply was “fried”
• Connected DC voltage to track and saw
train move!
• Took current measurements with this
setup
5
DC Sent to Track
• 1 Ohm resistor was placed between
source and track to measure current
Vin –
Vin +
6
Scope Display
• Scope across resistor should be current
the train is drawing
Current without train
was 1.06A RMS
Current with 1 Train
was .88A RMS
Current with
2 Trains was
.23A RMS
7
Current Sensing Research
• One way we thought to accomplish current
sensing was divide the current into ranges
• 0 current
–off
• Small current
–idle
• Large current
–running
• With the proper amplification, the A/D
would only need to discern between these
3 states
8
Microprocessor Research
• One variation of the 68HC12 has 2 10-bit
8 channel A/D’s
• With a 16-bit microprocessor the FPGA
board currently controlling DCC can be
eliminated and all processing done from
the microprocessor
9
Outline
• Current position on time line
• Accomplishments of week 3
• Goals for week 4
10
Problems to Address for Next Week
• Make sure power amp is ordered
• Simulate train with a resistor and design
hardware system and software system
11
Products
•
•
•
•
Power Supplies (5V and a 12V)
P2-100A
Meanwell 323424PS
Lenz LV101
12