EPA-SwRI Update (10-15-15)

• Testing Plan for Alternative Approach at SwRI

– Cummins ISB 300hp rating (24 points)

– Cummins ISB 200hp rating (24 points)

– Navistar N13 455hp rating (27 points)

– N13 engine with 365hp rating (27 points)

– Ford 6.8 liter gasoline engine (optional – depending on 

funding)

DRAFT & DELIBERATIVE 1
N13 Engine Platform

Mapping Points (55 and 65mph cycles)

DRAFT & DELIBERATIVE 2

Config

Number

32001 32002 32003 32004 32005 32006 32007 32008 32009

Cycles 55, 65 55, 65 55, 65 55, 65 55, 65 55, 65 55, 65 55, 65 55, 65

Mass (kg) 31,978 22,679 19,051 31,978 22,679 19,051 31,978 22,679 19,051

C dA 5.4 4.7 4.0 5.4 4.7 4.0 5.4 4.7 4.0

Tire C r r (kg/ton) 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9

Tire Radius (m) 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500

Rotating Inertia (kg) 1134 907 680 1134 907 680 1134 907 680

Axle Gear Efficiency (%) 95.5 95.5 95.5 95.5 95.5 95.5 95.5 95.5 95.5

Accessory Power (W) 1300 1300 1300 1300 1300 1300 1300 1300 1300

Engine speed @ 65 mph Min NTE 

Exclusion Spd

Min NTE 

Exclusion Spd

Min NTE 

Exclusion Spd

Speed B Speed B Speed B Max 1065 test 

speed

Max 1065 test 

speed

Max 1065 test 

speed

Trans 10-spd AMT 10-spd AMT 10-spd AMT 10-spd AMT 10-spd AMT 10-spd AMT 10-spd AMT 10-spd AMT 10-spd AMT

Top Gear Ratio 0.73 0.73 0.73 0.73 0.73 0.73 0.73 0.73 0.73

Axle ratio 2.63 2.63 2.63 3.57 3.57 3.57 4.62 4.62 4.62

Target engine speed @ 

65 mph

1066 1066 1066 1447 1447 1447 1871 1871 1871

Actual engine speed @ 

65 mph

1066 1066 1066 1447 1447 1447 1871 1871 1871
N13 Engine Platform

Mapping Points (ARB Cycle)

DRAFT & DELIBERATIVE 3

Config

Number

32010 32011 32012 32013 32014 32015 32016 32017 32018

Cycles ARB ARB ARB ARB ARB ARB ARB ARB ARB

Mass (kg) 31,978 22,679 19,051 31,978 22,679 19,051 31,978 22,679 19,051

C dA 5.4 4.7 4.0 5.4 4.7 4.0 5.4 4.7 4.0

Tire C r r (kg/ton) 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9

Tire Radius (m) 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500

Rotating Inertia (kg) 1134 907 680 1134 907 680 1134 907 680

Axle Gear Efficiency (%) 95.5 95.5 95.5 95.5 95.5 95.5 95.5 95.5 95.5

Accessory Power (W) 1300 1300 1300 1300 1300 1300 1300 1300 1300

Engine speed @ 65 mph Min NTE 

Exclusion Spd

Min NTE 

Exclusion Spd

Min NTE 

Exclusion Spd

Speed B Speed B Speed B Max 1065 test 

speed

Max 1065 test 

speed

Max 1065 test 

speed

Trans 6-spd HD AT 6-spd HD AT 6-spd HD AT 6-spd HD AT 6-spd HD AT 6-spd HD AT 6-spd HD AT 6-spd HD AT 6-spd HD AT

Top Gear Ratio 0.6716 0.6716 0.6716 0.6716 0.6716 0.6716 0.6716 0.6716 0.6716

Axle ratio 2.86 2.86 2.86 3.88 3.88 3.88 5.02 5.02 5.02

Target engine speed @ 

65 mph

1066 1066 1066 1447 1447 1447 1871 1871 1871

Actual engine speed @ 

65 mph

1066 1066 1066 1447 1447 1447 1871 1871 1871
18 Additional Test Points

DRAFT & DELIBERATIVE 4

Config

Number

32019 32020 32021 32022 32023 32024 32025 32026 32027 32028 32029 32030 32031 32032 32033 32034

Cycles 55, 65 55, 65 ARB ARB ARB ARB ARB ARB ARB ARB ARB ARB ARB ARB ARB ARB

Mass (kg) 31,978 22,679 31,978 22,679 31,978 22,679 19,051 31,978 22,679 31,978 22,679 31,978 22,679 19,051 31,978 22,679

C dA 5.05 4.35 5.05 4.35 5.4 4.7 4.0 5.4 4.7 5.05 4.35 5.4 4.7 4.0 5.4 4.7

Tire C r r (kg/ton) 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9

Tire Radius (m) 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500

Rotating Inertia (kg) 1134 907 1134 907 1134 907 680 1134 907 1134 907 1134 907 680 1134 907

Axle Gear Efficiency (%) 95.5 95.5 95.5 95.5 95.5 95.5 95.5 95.5 95.5 95.5 95.5 95.5 95.5 95.5 95.5 95.5

Accessory Power (W) 1300 1300 1300 1300 1300 1300 1300 1300 1300 1300 1300 1300 1300 1300 1300 1300

Engine speed @ 65 mph Speed A Speed A Speed A Speed A Speed B Speed B Speed B Max 1065 test 

speed

Min NTE 

Exclusion Spd

Speed A Speed A Speed B Speed B Speed B Max 1065 test 

speed

Min NTE 

Exclusion Spd

Trans 10-spd AMT 10-spd AMT 10-spd AMT 10-spd AMT 10-spd AMT 10-spd AMT 10-spd AMT 10-spd AMT 10-spd AMT 10-spd TC10 10-spd TC10 10-spd TC10 10-spd TC10 10-spd TC10 10-spd TC10 10-spd TC10

Top Gear Ratio 0.73 0.73 0.73 0.73 0.73 0.73 0.73 0.73 0.73 0.86 0.86 0.86 0.86 0.86 0.86 0.86

Axle ratio 2.90 2.90 2.90 2.90 3.57 3.57 3.57 4.62 2.63 2.46 2.46 3.03 3.03 3.03 3.92 2.23

Target engine speed @ 

65 mph

1174 1174 1174 1174 1447 1447 1447 1871 1066 1174 1174 1447 1447 1447 1871 1066

Actual engine speed @ 

65 mph

1174 1174 1174 1174 1447 1447 1447 1871 1066 1174 1174 1447 1447 1447 1871 1066

Notes Midpoint 

between 4 

lower left grid 

points

Midpoint 

between 4 

upper left grid 

points

Same as 

32019 with 

ARB cycle

Same as 

32020 with 

ARB cycle

Same as 

32013 with 

10-spd AMT

Same as 

32014 with 

10-spd AMT

Same as 

32015 with 

10-spd AMT

Same as 

32016 with 

10-spd AMT

Same as 

32011 with 

10-spd AMT

Same as 

32021 with 

TC10

Same as 

32022 with 

TC10

Same as 

32013 with 

TC10

Same as 

32014 with 

TC10

Same as 

32015 with 

TC10

Same as 

32016 with 

TC10

Same as 

32011 with 

TC10
Mapping Points for ARB Cycle

DRAFT & DELIBERATIVE 5

4.00

5.00

6.00

7.00

8.00

9.00

10.00

11.00

12.00

13.00

60.0 62.0 64.0 66.0 68.0 70.0 72.0 74.0

kW-hr

SN/SV

Interp/Extrap Points (Test Cell Data) Map Points (Test Cell Data)
Interpolation/Extrapolation (ARB)

DRAFT & DELIBERATIVE

6

Test Points Error

Config gfuel/kW-hri gfuel/kW-hri %

32010 215.21 215.21 0.00%

32011 219.95 219.95 0.00%

32012 224.68 224.68 0.00%

32013 216.53 216.53 0.00%

32014 226.09 226.09 0.00%

32015 236.85 236.85 0.00%

32016 227.42 227.42 0.00%

32017 238.81 238.81 0.00%

32018 248.14 248.14 0.00%

32021 219.15 220.33 0.54%

32022 225.02 232.32 3.25%

32023 217.41 218.79 0.64%

32024 222.79 228.91 2.75%

32025 232.43 229.77 -1.15%

32026 215.37 219.81 2.06%

32027 224.02 228.98 2.21%

32028 210.39 216.55 2.93%

32029 215.49 224.40 4.13%

32030 210.63 212.64 0.96%

32031 216.38 223.57 3.32%

32032 225.48 224.68 -0.35%

32033 213.51 217.21 1.73%

32034 213.70 222.98 4.34%

Test Cell Data
Regression Approach

• Model 1

– Global Regression as function of N/V and N/V*W

• Model 2

– Global Regression as function of N/V, N/V^2, and 

N/V*W

DRAFT & DELIBERATIVE 7
Regression Approach (ARB)

DRAFT & DELIBERATIVE 8

Model Predict Error Model Predict Error

Config gfuel/kW-hri gfuel/kW-hri % gfuel/kW-hri %

32010 215.21 211.62 -1.67% 211.73 -1.62%

32011 219.95 221.40 0.66% 221.18 0.56%

32012 224.68 225.43 0.33% 225.05 0.17%

32013 216.53 218.85 1.07% 219.12 1.20%

32014 226.09 229.31 1.42% 229.63 1.56%

32015 236.85 233.36 -1.47% 233.67 -1.34%

32016 227.42 227.98 0.24% 227.58 0.07%

32017 238.81 237.64 -0.49% 237.62 -0.50%

32018 248.14 242.07 -2.45% 242.13 -2.42%

32021 219.15 222.80 1.67% 223.11 1.81%

32022 225.02 231.95 3.08% 232.27 3.23%

32023 217.41 218.15 0.34% 218.23 0.38%

32024 222.79 227.86 2.28% 227.92 2.30%

32025 232.43 231.00 -0.62% 231.01 -0.61%

32026 215.37 219.09 1.72% 219.30 1.82%

32027 224.02 228.07 1.81% 228.08 1.81%

32028 210.39 215.28 2.32% 215.15 2.27%

32029 215.49 224.95 4.39% 224.72 4.28%

32030 210.63 214.25 1.72% 213.84 1.53%

32031 216.38 223.14 3.13% 222.56 2.86%

32032 225.48 226.57 0.48% 225.92 0.20%

32033 213.51 216.55 1.42% 216.39 1.35%

32034 213.70 221.98 3.88% 221.29 3.55%

Test Cell Data

MODEL 1 MODEL 2

Global Regression as function of N/V and N/V*W Global Regression as function of N/V, N/V^2, and N/V*W
Mapping Points for 55mph Cycle

DRAFT & DELIBERATIVE 9

0.00

5.00

10.00

15.00

20.00

25.00

30.00

15.0 20.0 25.0 30.0

kW-hr

SN/SV

Interp/Extrap Points (Test Cell Data) Map Points (Test Cell Data)
Interpolation/Extrapolation (55mph)

DRAFT & DELIBERATIVE

10

Test Points Error

Config gfuel/kW-hrigfuel/kW-hri %

32001 191.21 191.21 0.00%

32002 197.92 197.92 0.00%

32003 204.43 204.43 0.00%

32004 190.48 190.48 0.00%

32005 198.57 198.57 0.00%

32006 208.82 208.82 0.00%

32007 213.47 213.47 0.00%

32008 229.98 229.98 0.00%

32009 241.24 241.24 0.00%

32019 191.94 191.34 -0.31%

32020 194.38 197.41 1.56%

Test Cell Data
Regression Approach (55mph)

DRAFT & DELIBERATIVE 11

Model Predict Error Model Predict Error

Config gfuel/kW-hri

gfuel/kW-hri % gfuel/kW-hri %

32001 191.21 189.72 -0.78% 187.95 -1.71%

32002 197.92 201.51 1.81% 199.82 0.96%

32003 204.43 207.29 1.40% 205.64 0.59%

32004 190.48 187.80 -1.41% 189.31 -0.61%

32005 198.57 199.79 0.61% 201.38 1.41%

32006 208.82 205.53 -1.57% 207.16 -0.79%

32007 213.47 215.40 0.90% 215.44 0.92%

32008 229.98 230.82 0.36% 230.97 0.43%

32009 241.24 238.39 -1.18% 238.58 -1.10%

32019 191.94 171.14 -10.84% 285.69 48.84%

32020 194.38 180.74 -7.02% 295.36 51.95%

Test Cell Data

MODEL 1 MODEL 2

Global Regression as function of N/V and N/V*W Global Regression as function of N/V, N/V^2, and N/V*
Mapping Points for 65mph Cycle

DRAFT & DELIBERATIVE 12

0.00

5.00

10.00

15.00

20.00

25.00

30.00

35.00

15.0 20.0 25.0 30.0

kW-hr

SN/SV

Interp/Extrap Points (Test Cell Data) Map Points (Test Cell Data)
Interpolation/Extrapolation (65mph)

DRAFT & DELIBERATIVE 13

Config gfuel/kW-hri

gfuel/kW-hri %

32001 191.27 191.27 0.00%

32002 189.19 189.19 0.00%

32003 166.05 166.05 0.00%

32004 197.96 197.96 0.00%

32005 188.82 188.82 0.00%

32006 0.00 #DIV/0!

32007 234.64 234.64 0.00%

32008 249.45 249.45 0.00%

32009 257.93 257.93 0.00%

32019 190.79 192.87 1.09%

32020 191.60 183.77 -4.09%
Regression Approach (65mph)

DRAFT & DELIBERATIVE 14

Model Predict Error Model Predict Error

Config gfuel/kW-hrigfuel/kW-hri % gfuel/kW-hri %

32001 191.27 174.54 -8.74% 180.98 -5.38%

32002 189.19 177.93 -5.95% 182.37 -3.60%

32003 166.05 179.84 8.30% 183.16 10.30%

32004 197.96 204.43 3.27% 192.39 -2.81%

32005 188.82 209.31 10.85% 194.39 2.95%

32006 #DIV/0! #DIV/0!

32007 234.64 237.86 1.37% 245.23 4.51%

32008 249.45 244.13 -2.13% 247.81 -0.66%

32009 257.93 247.36 -4.10% 249.14 -3.41%

32019 190.79 183.72 -3.71% 181.03 -5.12%

32020 191.60 187.43 -2.18% 182.56 -4.72%

MODEL 1 MODEL 2

Global Regression as function of N/V and N/V*W Global Regression as function of N/V, N/V^2, a

Test Cell Data