Momentum - February 2021 - 12

Keweenaw Research Institute/Michigan Technological University

Student Generation

The UMD sled in its garage bay at the 2020 SAE Clean Snowmobile Challenge.
application that varies RPM quickly and
drastically with little steady-state driving. A
custom camshaft was also needed to properly
mount the cam phaser. The cam phaser functions
by using engine oil pressure to pressurize
different cavities within the phaser to rotate the
camshaft forward or backward relative to the
camshaft sprocket and is capable of 70 crank
angle degrees of phasing.
	
This system improves emissions by
controlling how much fuel and air enter the
engine, further than just the throttle body. It also
allows for a primitive Exhaust Gas Recirculation
within the cylinders to help cool combustion
temperatures. At idle, the camshaft is phased so
as little air and fuel enter the engine as possible
to keep the engine running, whereas while
driving, the camshaft is phased according to
engine load, throttle position, and RPM. To tune
this new system, the team added 8 new fuel
maps (one for every 10 crank angle degrees of
phasing) for accurate fueling throughout the
phasing range. An Air Flow Demand calculation
was also implemented into the MoTeC ECU to tie
the boost control, VCT, and throttle together to
help each system react quicker by proactively
changing these variables rather than traditionally
reacting to the engine conditions.
	
The turbocharged VCT ProStar 1000
produced the fourth-highest E Score of the
competition at 195 and the second best weighted
Brake Specific Fuel Consumption of 314 g/kW-hr
in the lab emissions event, all while the ECU
wasn't able to properly read the air/fuel ratio due

12 February 2021

Getting in some nighttime riding and testing.
to a faulty oxygen sensor. This, once again, proves the UMD Clean
Snowmobile Team is continually pushing innovation in this competition
forward. On top of the virtual, simulation-based competition for 2021, the
team plans to improve the VCT and boost tuning, heavily invest in chassis
sound and efficiency testing and improvements, test and gather data on the
team's engine dynamometer, and improve the overall reliability. These
improvements will result in a very competitive, marketable, and fun-to-ride
entry to the 2021 competition. n
Cory Huot, a senior studying mechanical engineering at the University of
Minnesota Duluth, wrote this article for MOMENTUM. He is president of the
UMD Clean Snowmobile team for the 2020-2021 SAE Clean Snowmobile
Challenge season.

MOMENTUM



Momentum - February 2021

Table of Contents for the Digital Edition of Momentum - February 2021

Momentum - February 2021 - Cover1
Momentum - February 2021 - Cover2
Momentum - February 2021 - 1
Momentum - February 2021 - 2
Momentum - February 2021 - 3
Momentum - February 2021 - 4
Momentum - February 2021 - 5
Momentum - February 2021 - 6
Momentum - February 2021 - 7
Momentum - February 2021 - 8
Momentum - February 2021 - 9
Momentum - February 2021 - 10
Momentum - February 2021 - 11
Momentum - February 2021 - 12
Momentum - February 2021 - 13
Momentum - February 2021 - 14
Momentum - February 2021 - 15
Momentum - February 2021 - 16
Momentum - February 2021 - 17
Momentum - February 2021 - 18
Momentum - February 2021 - 19
Momentum - February 2021 - 20
Momentum - February 2021 - 21
Momentum - February 2021 - 22
Momentum - February 2021 - 23
Momentum - February 2021 - 24
Momentum - February 2021 - 25
https://www.nxtbook.com/smg/sae/21MOMP02
https://www.nxtbook.com/nxtbooks/sae/20MOMP11
https://www.nxtbook.com/nxtbooks/sae/20MOMP10
https://www.nxtbook.com/nxtbooks/sae/20MOMP09
https://www.nxtbook.com/nxtbooks/sae/20MOMP04
https://www.nxtbook.com/nxtbooks/sae/20MOMP03
https://www.nxtbook.com/nxtbooks/sae/20MOMP02
https://www.nxtbook.com/nxtbooks/sae/19MOMP11
https://www.nxtbook.com/nxtbooks/sae/19MOMP10
https://www.nxtbook.com/nxtbooks/sae/19MOMP09
https://www.nxtbook.com/nxtbooks/sae/19MOMP04
https://www.nxtbook.com/nxtbooks/sae/19MOMP03
https://www.nxtbook.com/nxtbooks/sae/19MOMP02
https://www.nxtbook.com/nxtbooks/sae/18MOMP10
https://www.nxtbook.com/nxtbooks/sae/18MOMP03
https://www.nxtbook.com/nxtbooks/sae/18MOMP02
https://www.nxtbook.com/nxtbooks/sae/17MOMP11
https://www.nxtbook.com/nxtbooks/sae/17MOMP10
https://www.nxtbook.com/nxtbooks/sae/17MOMP09
https://www.nxtbook.com/nxtbooks/sae/17MOMP04
https://www.nxtbook.com/nxtbooks/sae/17MOMP03
https://www.nxtbook.com/nxtbooks/sae/17MOMP02
https://www.nxtbook.com/nxtbooks/sae/16MOMP11
https://www.nxtbook.com/nxtbooks/sae/16MOMP10
https://www.nxtbook.com/nxtbooks/sae/16MOMP09
https://www.nxtbook.com/nxtbooks/sae/16MOMP04
https://www.nxtbook.com/nxtbooks/sae/16MOMP03
https://www.nxtbook.com/nxtbooks/sae/16MOMP02
https://www.nxtbook.com/nxtbooks/sae/15MOMP11
https://www.nxtbook.com/nxtbooks/sae/15MOMP10
https://www.nxtbook.com/nxtbooks/sae/15MOMP09
https://www.nxtbook.com/nxtbooks/sae/15MOMP04
https://www.nxtbook.com/nxtbooks/sae/15MOMP03
https://www.nxtbook.com/nxtbooks/sae/15MOMP02
https://www.nxtbook.com/nxtbooks/sae/14MOMP11
https://www.nxtbook.com/nxtbooks/sae/14MOMP10
https://www.nxtbook.com/nxtbooks/sae/14MOMP09
https://www.nxtbook.com/nxtbooks/sae/14MOMP04
https://www.nxtbook.com/nxtbooks/sae/14MOMP03
https://www.nxtbook.com/nxtbooks/sae/14MOMP02
https://www.nxtbook.com/nxtbooks/sae/13MOMD1101
https://www.nxtbook.com/nxtbooks/sae/13MOMD0930
https://www.nxtbook.com/nxtbooks/sae/13MOMD0830
https://www.nxtbook.com/nxtbooks/sae/13MOMD0401
https://www.nxtbook.com/nxtbooks/sae/13MOMD0301
https://www.nxtbook.com/nxtbooks/sae/13MOMD0201
https://www.nxtbook.com/nxtbooks/sae/12MOMD1031
https://www.nxtbook.com/nxtbooks/sae/12MOMD0928
https://www.nxtbook.com/nxtbooks/sae/12MOMD0831
https://www.nxtbook.com/nxtbooks/sae/12MOMD0330
https://www.nxtbook.com/nxtbooks/sae/12MOMD0228
https://www.nxtbook.com/nxtbooks/sae/12MOMD0128
https://www.nxtbook.com/nxtbooks/sae/11MOMD1028
https://www.nxtbook.com/nxtbooks/sae/11MOMD0929
https://www.nxtbook.com/nxtbooks/sae/11MOMD0829
https://www.nxtbook.com/nxtbooks/sae/11MOMD0331
https://www.nxtbook.com/nxtbooks/sae/11MOMD0225
https://www.nxtbook.com/nxtbooks/sae/11MOMD0128
https://www.nxtbook.com/nxtbooks/sae/10MOMD1029
https://www.nxtbook.com/nxtbooks/sae/10MOMD0930
https://www.nxtbook.com/nxtbooks/sae/10MOMD0831
https://www.nxtbook.com/nxtbooks/sae/10MOMD0331
https://www.nxtbook.com/nxtbooks/sae/10MOMD0226
https://www.nxtbook.com/nxtbooks/sae/10MOMD0129
https://www.nxtbookmedia.com