SmartWay
MENTAL PROTECTION AGENCY»
U.S. ENVIRONMENTAL PROTECTION AGENCY
May 2O12
Interim Test Method for Verifying
Fuel-Saving Components for SmartWay:
Modifications to SAE J1321
SmartWay
Tractor & Trailer
Program
U.S. Environmental Protection
Agency Designated SmartWay
equipped with cleaner, fuel-savins
features. SmartWay tractors and
of 1O to 2O percent (saving car
riers between 1,7OO and 3,3OO
gallons of diesel fuel annually),
lower greenhouse-gas emissions,
and significantly reduce oxides of
nitrogen, particulate matter, and
other air pollutants.
Agency how the Joint TMC/SAE
Fuel Consumption Test Procedure
Recommended Practice (October,
1986) to create an interim test meth
od to quantify the fuel consumption
impact of fuel-saving equipment.
This test method is intended for
testing new class 8, sleeper cabs
and certain trailer aerodynamic
components for the purpose of
determining eligibility for inclusion
in SmartWay.
Modification to Joint SAE/TMC
The Joint TMC/SAE Fuel Consumption Test Procedure - Type II (SAE J1321
Surface Vehicle Recommended Practice (October,l986) is modified by add-
ing the following provisions:
1. Test must be conducted on a test track, not a roadway.
2. Test track length greaterthan 1.5 miles (5 miles recommended).
3. Track must be circular, figure eight, or oval in shape.
4. Track surface must be completely dry, we 11-maintained, and be com-
prised of a surface typical of highway surfaces (asphalt or cement).
5. Grade change on test track not greater than 2 degrees.
6. Altitude of test facility not greater than 4,000 feet above sea level.
7. No precipitation on the test track for duration of test.
8. Ambient air temperatures at the test track must be between 5 C to 35
C (41 F to 95 F) provided that the air temperature during the entire test
does not fluctuate mo re than 30 degrees F (approximately 16.6 C).
9. Wind speed at the test track cannot exceed 12 mph for duration of test.
10. Wind gusts at the test track cannot exceed 15 mph for duration of test.
11. Top speed of test drive cycle not to exceed 65 mph.
12. Test trailer configuration must be a typical dry box semi-trailer, 53'
long, 102" wide, and 13' 6" high.
13. Trailers must be the same model and similar age, mileage and condition.
14. Each trailer must have the same test payload. The combined weight of
the trailer and payload must be approximately 46,000 pounds, +/- 500
pounds.
15. Test payload must be loaded over axle to be consistent with federal
bridge laws. Payload must be secured so it does not shift during the
test.
16. Tires must be inflated to manufacturer-recommended maximum cold
inflation pressure prior to start of test.
17. Tires must beas similaras possible in size and condition, and have ac-
cumulated at least 500 miles wear-in prior to start of test.
18. The tractor-trailer gap must be the same on both trucks, as measured
from the back of the tractor to the front of the trailer.
19. If testing a candidate tractor against a current SmartWay tractor model
for the purpose of demonstrating SmartWay eligibility, the two tractors
must have substantially similar drive train and power train configura-
tion, including gear ratio, engine horsepower and size, transmission
type, lubricant type, rear axle ratio, accumulated mileage, emissions
aftertreatment system, etc.
20. If testing trailer modifications or trailer aerodynamic equipment, test
tractors must be equipped with features typical of line haul combi-
nation trucks - e.g., high roof fairing, side cab extender fairings, and
aerodynamic profile.
21. EPA must review and approve the test plan and the vehicle configura-
tion prior to testing.
SmartWay Transport | EPA-420-F-12-022 | www.epa.gov/smartway | 734-214-4767 | SmartWay-tech@epa.go
-------
22. EPA reserves the right to review all test data and to
reject any test it determines was not conducted in ac-
cordance with these provisions and / or SAE J1321, or
otherwise not credible according to good engineering
judgment.
General requirement
All provisions of SAE J1321 must be followed, in addition
to the above EPA provisions. Trucks must be prepared and
maintained accordingto SAE Jl32l,and results must be
within SAE test minimum acceptable ratios to be a valid
test. All measurement devices must be NIST-traceable. The
fuel must meet all applicable ASTM standards for motor
fuel forthe intended application.
The manufacturers will submit a test report to EPA that
includes signatures from the test facility and manufac-
turer certifying that the testing was conducted in an
accordance with the SAE J1321 as modified by the most
recent EPA requirements.
Testing Costs
The manufacturer bears all costs for testing.
Contact EPA
Interested organizations should contact EPA prior to test-
ing. To contact us:
send an e-mail to: Tech_center(3epa.gov or
write to Technology Assessment Center, US EPA,1200
Pennsylvania Avenue NW Mail Code: 6406J, Washing-
ton DC 20460.
If you have questions regarding SmatWay Designated
Tractors and Trailers or SmartWay verified technologies,
contact the Technology Assessment Center at:
Tech_center@ epa.gov.
SmartWay Transport | EPA-420-F-12-022 | www.epa.gov/smartway | 734-214-4767 | SmartWay-tech@epa.gov
------- |