New platform puts autonomous bus in motion: Dean Deter
August 2, 2018
Dean Deter has a knack for what he calls “tinkering.” A self-proclaimed gear head, Deter grew up around computers and cars, satisfying his curiosity to understand how anything with an engine or hardware works.
“As a kid I would spend hours in the garage with my buddy’s dad and grandfather who owned hot rods, rebuilding engines and cars,” he remembers.
That ability to get lost underneath a car hood serves him well in his role today as a researcher in ORNL’s Vehicle Systems Research Group and coordinator of the Vehicle Systems Integration (VSI) Laboratory.
A native of South Bend, Indiana, Deter came to East Tennessee as a middle-schooler, relocating so his dad could begin a career at ALCOA. When he graduated from high school, his family decided to move back to the Midwest but Deter chose to make East Tennessee his home and enrolled at the University of Tennessee (UT) to study mechanical engineering. The opportunity to complete an internship at ORNL, first as an undergraduate intern working in the Fuels, Engines and Emissions Research Group and later as a graduate student (UT) in the VSI Lab working on controls, led to a full-time researcher position after graduation.
Deter was hired in 2012 to help configure and set-up the VSI Laboratory. When the coordinator position opened up in 2017, Deter was tapped to lead VSI efforts. “That was the best thing that could happen for my career,” he said. “I learned so much from the previous coordinator and I was in a good position to take the next step.”
Even with his previous knowledge, Deter said taking over the leadership position was at times trial by fire. “This is the great thing about ORNL though – if you are a self-driven person here, there’s lots of opportunities to really take control of the research and contribute,” he said.
For the past six months, Deter has been contributing to transportation research in a big way. He and a team of researchers have been devoted to understanding an unusual type of vehicle—ORNL’s first autonomous bus, named GROVER (Ground-based Robotic Omnidirectional Vehicle for Electric-mobility Research). In Fall 2017, Deter and fellow researchers were tapped to figure out how to make GROVER not only autonomous, but also able to see obstacles and navigate around them. They were working within an accelerated timeframe: the pair had to demonstrate GROVER by March 2018, a mere few months after accepting the challenge, and make it ready for its public debut during the ORNL 75th Anniversary Lab Day open house in early June.
The 3D printed GROVER is a small 12-passenger shuttle bus that operates on a platform originally built for the Navy to move munitions on aircraft carriers. The platform is designed to make tight turns and rotations and has four wheels that operate independently of each other, rotating a full 360 degrees, allowing movement in any direction—even sideways.
“We had aggressive milestones. The first was to go from point A to point B completely autonomously and have collision avoidance and the ability to stop when an object gets in the way,” Deter said. “We did that by March.”
Deter says the next milestone is to finish the integration of all the sensors within GROVER, which operates off of laser sensors called LiDAR. “We’ve completed all of the autonomous controls. You hit a button and it will drive you from building one to building two and it will stop if it sees obstacles,” he said. “it’s just like a trolley bus. It stops if something is in the way, and if there is enough space it will move around an object too.”
Next-level work on GROVER will include machine vision and machine learning applications.
GROVER is unique in that it provides the ability to test sensors and controls, batteries, and power electronics all in one platform, giving researchers full control. “GROVER gives us that vehicle to test anything we want, safely and efficiently,” Deter noted.
Creating virtual realities for real road scenarios
GROVER and other ORNL 3D-printed vehicles such as the Shelby Cobra and the Printed Utility Vehicle are also road-ready tested in the VSI Lab. Using “hardware-in-the-loop” technology, virtual vehicle environments are created to simulate how the engine or motor would perform on the road. The VSI Lab can accommodate a wide range of platforms, from light-duty vehicles such as the Cobra to heavy-duty trucks with electrified powertrains.
Deter says that the VSI Lab is beginning to create a full virtual road environment that can simulate all scenarios— such as speed limit changes because of road construction and traffic lights.
“There’s a whole plethora of scenarios we have yet to investigate in the VSI,” said Deter. “The beauty of it is you can crash into a virtual vehicle and not a real one. We design for the most common crash cases and then try to think of what else could possibly go wrong. That’s the fun part.”
The father of a young family with two toddlers, Deter builds and races cars as a hobby. He’s built engine parts for race cars on the regional level and recently has been working on parts for a national race.
As someone who has always been comfortable in the driver’s seat, Deter says that one day he may find himself enjoying an autonomous ride on his daily commute. “It’s hard for me to give that up because I like to drive,” he said. “But the research we’re doing now may make self-driving cars more common in the future.”
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