Sanjai Bashyam presented on his internship project analyzing fuel pressure data. He developed code to view continuous pressure data from the ring buffer and compare it to data from the PIP buffer in order to investigate unexplained pressure offsets. By collecting data from the ring buffer in 200 element segments and piecing it together, he was able to identify pump cutout events. The results were a new ability for the software and test teams to view continuous pressure data and validate the PIP buffer. Future work may implement a 16-bit SDADC to further resolve issues.

1. Sanjai Bashyam
Fuel Systems Specific Controls Intern
Summer 2016 Intern Presentation

2. About Me
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 University of Texas at Austin
– B.S. Electrical Engineering May 2017
 Born in Cincinnati, Ohio and moved
to Austin, Texas at 6 years old
 Eagle Scout and 4 years of high
school robotics in FIRST Robotics
Competition
 Founding member of UT FSAE –
Electric
 Co-creator of Innovation Station, a
3D Printing Vending Machine

3. Terminology and Background
 PIP (pre-injection processing)– 10 kHz pressure data accumulator
 PIP Tool – Engineering tool used to download pressure buffers for
analysis
 Ring Buffer – Circular buffer that holds 2000 most recent pressure
samples
 PIP Buffer – Sample of ring buffer prior to injection event
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4. Major Project
 Problem
– PIP Tool displays single
pump cutout events and
injection events
– Unexplained offsets in
pressure in between
injection events
– Pressure data is only visible
through PIP buffer during
pump cutouts
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Pressure variations

5. Major Project
 Objectives
– Develop code and analysis script to view
continuous pressure data from ring buffer
– Collect and compare pressure data between ring
buffer and PIP buffer to validate PIP buffer
– Investigate 16-bit SDADC to potentially resolve
the issue
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6. Major Project – Data Collection
 Actions
– Studied PIP buffer C code to
identify relevant functions
– Used portable bench to verify
functionality of data collection
– Progressed to closed-loop bench
to collect real data
– Forced to collect 200 elements at
a time because of software
limitations imposed by Veristand 6

7. Major Project – Data Analysis
 Actions
– Piece together each 200 element segment of ring buffer in
MatLAB
– Plot and identify pump cutout events in ring buffer
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8. Major Project
 Results
– Software and Test team has new ability to view continuous
pressure data from ring buffer
– Ring buffer’s validity will be confirmed
 Future
– Software and Test team may implement 16-bit SDADC
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9. Internship Highlights
 Engine Familiarization
 Ride and Drive
 White Rock
 Cummins Soccer Tournament
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10. Takeaways
 Familiarity with many software and engineering tools
 Fuel system in diesel engines and fuel system specific controls
 Functionality of PPT, Software, Test, and Applied Controls teams in
FSSC
 Work process and workflow in FSSC
 Connection of control theory and coursework
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11. Acknowledgements
 FSSC Team
 Tim Viola
 Nate Linen
 Rick Reisinger
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12. Questions?
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