SAE J1256:2002 pdf download

SAE J1256:2002 pdf download Fuel Economy Measurement—Road Test Procedure— Cold Start and Warm-Up Fuel Economy
1. Scope—This procedure is a modification of the urban driving cycles noted in SAE J1082 and which is run on
a suitable road or test track. The procedure yields cold startwarm-up fuel economy values indicative ofconsumer level at the ambient condition of the test. Within referenced limitations,the procedure can beutilized to determine the fuel economy differential among vehicles or between vehicle changes.
1.1Purpose—This SAE Recommended Practice provides a uniform test procedure for measuring the fuel
economy of light-duty vehicles during cold start and warm-up operation(motor vehicles designed primarily fortransportation of persons or property and rated at 4500 kg Gvw (10 000 lb) or less) on suitable roads.
2.References
2.1 Applicable Publications—The following publications form a part of this specification to the extent specfied
herein. The latest issue of SAE publications shall apply.
2.1.1 SAE PUBLICATIONS—Available from SAE, 400 Commonwealth Drive, Warrendale,PA 15096-0001.
SAE J1082—Fuel Economy Measurement Road Test Procedure
SAE J1263—Road Load Measurement and Dynamometer Simulation Using Coastdown Techniques
2.1.2 ASTM PUBLICATION—Available from ASTM,100 Barr Harbor Drive, West Conshohocken,PA 19428-2959.
ASTMD4814—Standards Specification for Automotive Spark-lgnition Engine Fuel Petroleum
Measurement Tables
2.1.3OTHER PUBLICATION
Energy Policy and Conservation Act， Public Law 94-163,94th Congress S.622,December 22,1975.
3.Definitions
3.1 Driving Cycle—The urban driving pattern is defined by 8.3.4.2. This driving pattern is a modification for cold
starting of the SAEJ1082 urban driving cycle.
3.2Test Vehicle—Passenger car and light truck prepared for test according to Section 7.
3.3 Test Vehicle Weight—Unloaded vehicle weight (curb weight) plus 1 36 kg (300 lb). 3.3.1 C HASSIS D YNAMOMETER I NERTIA W EIGHT A ND H ORSEPOWER S ETTINGS —Should be established and set in accordance with SAE J1 263.
3.4 Observed Cold Fuel Economy—Observed cold fuel economy will be reported for both 0 to 3.2 km (0 to 2mile) and 0 to 6.4 km (0 to 4 mile) cycles. The 0 to 3.2 km (0 to 2 mile) observed fuel economy will be determined by dividing the 3.2 km (2.0 mile) of the urban cycle by the fuel consumed during Cycle 1 . The 0 to 6.4 km (0 to 4 mile) observed fuel economy will be determined by dividing 6.4 km (4.0 mile) by the total fuel consumed during Cycle 1 and Cycle 2. Economy will be expressed in kilometers per liter (miles per gallon).
3.5 Corrected Cold Fuel Economy—Corrected economy is the observed economy multiplied by the correction factors listed in Section 1 1 and Section 1 2. Corrected fuel economy will be expressed as kilometers per liter (miles per gallon).
3.6 Correction Factors—Factors which are used to adjust data to the standard ambient condition of 1 5.6 °C (60 °F) and reference fuel properties.
3.7 Average Fuel Economy—Average fuel economy is the total distance driven divided by the total volume of fuel consumed in a series of replicate tests. When the distance driven in each of the tests is identical, as may be assumed for this procedure, the average fuel economy is determined by taking the harmonic average of the individual economies. See Equation 1 .