It has been a busy week at the EPA’s National Vehicle and Fuel Emissions Laboratory (NVFEL) in Ann Arbor, MI as five teams were able to complete several dyno testing sessions on both the 2WD dyno and 4WD dyno.
The Ohio State team was excited to use the 4WD chassis dyno at EPA because they only have 2WD dyno capabilities at their university.
“With the 4WD dyno, some of the major focuses of our testing have been tuning our electrically heated catalyst control and some engine transient testing on the EPA drive cycles,” said Ohio State controls team lead John Kruckenberg.
The Ohio State team was able to analyze their catalyst control in hopes of improving their emissions of cold starts and getting a better baseline for how their vehicle performs on the road.
“In the second four-hour drive cycle, we were able to complete the official EPA certification dyno test so we could compare our previous test cycles to that of our electric drive mode to see how the vehicle runs on a standard cycle.”
Other teams, like Mississippi State, decided to test their urea-injection system that reduces NOx emissions in diesel fuel. This type of testing helps determine the optimal amount of urea to inject into the system for emissions purposes.
“You must inject sufficient amounts of urea to reduce the NOx emissions to a suitable level; however, if an excessive amount of urea is injected, this will cause ammonia to accumulate in the catalyst potentially resulting in harm to the system,” said Mississippi State Faculty Advisor Marshall Molen.
The University of Waterloo was also able to complete several dyno sessions this week at EPA. Their fuel cell plug-in hybrid electric vehicle (FC-PHEV) is just one of two in this competition.
“We ran a combination of urban and highway cycles just to get a baseline for vehicle performance and to be able to data log our powertrain,” said University of Waterloo team leader Michael Giannikouris.
“We also had the opportunity to get to do custom acceleration tests that allowed us to tune certain controls parameters on the dyno.”As the Group A dyno testing came to a close, both students and advisors agreed that this workshop was really beneficial.
“It has been great to work with EPA personnel and equipment,” said Will Dickerson, team member for Mississippi State. “We are able to get a better understanding of the kind of testing procedures that are relevant to today’s emissions testing.”