University of Minnesota – DuluthDesign Presentation

University of Minnesota – DuluthDesign Presentation

2006 Clean Snowmobile Challenge2006 Clean Snowmobile Challenge

Design Strategy:

To reengineer a snowmobile to maintain or improve performance while decreasing emissions and noise.

Design Strategy:

To reengineer a snowmobile to maintain or improve performance while decreasing emissions and noise.

Catalytic converter to reduce emissionsSecondary air supply for further

emissions controlChassis noise dampenerUtilization of stock components to keep

build costs to a minimum

Catalytic converter to reduce emissionsSecondary air supply for further

emissions controlChassis noise dampenerUtilization of stock components to keep

build costs to a minimum

SnowmobileSnowmobile

2006 Polaris FST 750 cc 4-stroke Turbocharged with intercooler 135 hp

2006 Polaris FST 750 cc 4-stroke Turbocharged with intercooler 135 hp

Build GoalsBuild Goals

Dependability

Minimal additional build costs

Improve current snowmobile durability

Dependability

Minimal additional build costs

Improve current snowmobile durability

CoolingCooling

Relocated intercooler Additional cooling fan

Additional air intakeChassis noise dampener and

lengthened snowflap

Relocated intercooler Additional cooling fan

Additional air intakeChassis noise dampener and

lengthened snowflap

EmissionsEmissions

3-way catalyst Reduce emissions

2CO + O2 → 2CO2

2NO → O2 + N2

or 2NO2 → N2 + 2O2

HC + O2 → CO2 + H2O

Secondary air injection Add extra oxygen for reactions

3-way catalyst Reduce emissions

2CO + O2 → 2CO2

2NO → O2 + N2

or 2NO2 → N2 + 2O2

HC + O2 → CO2 + H2O

Secondary air injection Add extra oxygen for reactions

Emissions DataEmissions Data

HC in PPM at 5300rpm

5

0.80

36.75

0

5

10

15

20

25

30

35

40

Parts Per Million (ppm)

Cat

Cat /w Air

Stock

HC in PPM at 5300rpm

5

0.80

36.75

0

5

10

15

20

25

30

35

40

Parts Per Million (ppm)

Cat

Cat /w Air

Stock

Emissions DataEmissions Data

Co % at 5300rpm

0.16

0.02

1.635

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

Percentage (%)

Cat

Cat /w Air

Stock

Emissions DataEmissions Data

NOx in PPM at 5300rpm

40.4

33.00

3

0

5

10

15

20

25

30

35

40

45

Parts Per Million (ppm)

Cat

Cat /w Air

Stock

ExhaustExhaust

Addition of catalytic converter

Lengthened/expanded exhaust system

Exhaust temperature control

Utilization of stock resonator

Addition of catalytic converter

Lengthened/expanded exhaust system

Exhaust temperature control

Utilization of stock resonator

Catalytic ConverterCatalytic Converter

Small physical footprintSecondary air inlet into oxidation

catalyst2 honeycomb elements

Small physical footprintSecondary air inlet into oxidation

catalyst2 honeycomb elements

NoiseNoise

Exhaust noise dampeningRubber chassis noise dampenerSound absorption foam

Exhaust noise dampeningRubber chassis noise dampenerSound absorption foam

Design ImprovementsDesign Improvements

Heated air supply for catalytic converterVariable air injectionModulating chassis noise dampenerHeated slide rail design to prevent snow

buildupAntilock Braking/Traction Control

system

Heated air supply for catalytic converterVariable air injectionModulating chassis noise dampenerHeated slide rail design to prevent snow

buildupAntilock Braking/Traction Control

system

Questions?Questions?