1、 Access to Additional Content for SAE J1321, Dated: February 2012 (Click here to view the publication) This Page is not part of the original publication This page has been added by IHS as a convenience to the user in order to provide access to additional content as authorized by the Copyright holder
2、 of this document Click the link(s) below to access the content and use normal procedures for downloading or opening the files. 1321 data analysis final-1 License Agreement J1321 Information contained in the above is the property of the Copyright holder and all Notice of Disclaimer in the defined fo
3、rmat, with the defined statistical analysis, with vehicle configuration description and with environmental test information described in this procedure. e. Test results are valid only for the vehicle configuration, test conditions and test cycle under which the test was conducted.f. All vehicles use
4、d in the test must have the same; external surface contours (preferably the same make, model and year), tires and wheels (preferably the same type, condition and mileage) aerodynamic configuration, power-train, and are in the same operational and physical condition. Tread must be of the same scalabl
5、e depth. g. All vehicles must be operated at identical speed, on identical road surfaces and within allowable temperature and wind conditions described within this document. See items h and i below. h. The allowable mean wind speed during a run shall be limited to values less than or equal to 12mph
6、(19.3 km/h). Maximum wind gust (less than 2 sec duration) during a run must be less than 15 mph (24.15 km/h). The recommended maximum allowable change in mean wind speed between segments and between runs of a segment shall be less than or equal to 5 mph (8.05 km/h). i. Tests shall only occur when th
7、e ambient air temperature during a run is between 40 F (4.44 C) and 100 F (37.8 C).The recommended maximum allowable change in air temperature between segments and between runs of a segment shall be 30 F (16.7 C). j. All Runs are valid and all test data collected from each Run are valid. All test da
8、ta must be included in the statistical analysis process. Test data may be excluded from the statistical analysis if a documented equipment failure or malfunction or driver error has occurred or weather condition requirements have been violated. The source of the failure must be recorded and document
9、ed in the test report.SAE J1321 Revised FEB2012 Page 5 of 50 k. The test site environmental conditions must be recorded through out the test. The required environmental data include, but not limited to: temperature, wind speed and direction. The data sampling rate must be sufficient to capture any t
10、ransient environmental effects. l. The test procedure does not generate aerodynamic data. m. The general applicability of a valid test result to different environmental factors may be determined when a subsequent valid test result produces a statistically similar value to the initial valid test resu
11、lt.n. If the confidence interval value for a test is greater than or equal to the nominal test value, as determined by the statistical analysis results, it is recommended that additional runs may be conducted to reduce the confidence interval value to less than the nominal test value. For example, i
12、f the test result is a nominal value of 3% a confidence interval value of 4%, additional runs may reduce the confidence interval to a value less than the nominal value. If additional runs do not show statistically conclusive results, the user must conclude that the change in fuel consumption is eith
13、er being influenced by variations in the test environment (i.e. weather, driver, etc.) or is less than the test precision. o. This test procedure requires the use of identical vehicles and therefore it cannot be used to determine the difference in fuel consumption between two different test vehicles
14、 (i.e. truck to truck comparisons). It is recommended that SAE J1526 test procedure be used to determine the difference in fuel consumption between two different test vehicles.1.3 Document Use All users of this document are encouraged to review all sections of this document prior to executing a test
15、 program.This document is structured to service both the novice and the expert user. 2. REFERENCES 2.1 Applicable Publications The following publications form a part of the specification to the extent specified herein. Unless otherwise indicated the current revision of SAE publications shall apply.
16、2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.SAE J1252 SAE Wind Tunnel Test Procedure for Trucks and Buses SAE J2084 Aerodynamic Testing of Road Vehicle
17、s Testing Methods and ProceduresSAE J1526 Joint TMC/SAE Fuel Consumption In-Service Test Procedure Type III SAE Paper No. 810025 “Transit Bus Fuel Economy Test”, H. H. Buckel SAE J1594 Vehicle Aerodynamics Terminology SAE 2009-01-1605 “Fuel Consumption Tests for Evaluating the Accuracy and Precision
18、 of Truck Engine Electronic Control Modules to Capture Fuel Data“, M. Surcel J. Michaelsen SAE J1321 Revised FEB2012 Page 6 of 50 2.1.2 Other Publications Aerodynamics of Road Vehicles, edited by W.H. Hucho, SAE 1998 Experimental Validation and Uncertainty Analysis for Engineers, Coleman, H. and Ste
19、ele, G., 3rd ed., Wiley, 2009 Wind Energy Resource Atlas of America, DOE/CH 10093-4, Oct. 1986, DE86004442 2.2 Related Publication The following publications are provided for information purposes only and are not a required part of this SAE Technical Report.2.2.1 SAE Publications Available from SAE
20、International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.SAE J2711 Recommended Practice for Measuring Fuel Economy and Emissions of Hybrid-Electric and Conventional Heavy-Duty Vehicles SAE J2881 Measurement
21、 of Aerodynamic Performance for Mass-Produced Cars and Light-Duty Trucks SAE J1263 Road Load Measurement and Dynamometer Simulation Using Coastdown Techniques SAE J2263 Road Load Measurement Using Onboard Anemometry and Coastdown Techniques SAE J1264 Joint RCCC/SAE Fuel Consumption Test Procedure (S
22、hort Term In-Service Vehicle) Type 12.2.2 Other Publications TMC Report, “Report of Frederick, Maryland, Truck and Bus Fuel Economy Demonstration, Conducted October 22-November 1, 1979, by the Joint TMC/SAE Task Force for In-Service Test Procedures of The American Trucking Industry,“ November 1980.
23、TMC RP 1109, Type IV Fuel Economy Test Procedure TMC RP 1102, TMC/SAE In-Service Fuel Consumption Test Procedure - Type II TMC RP 1103, TMC/SAE Fuel Consumption In-Service Test Procedure Recommended Practice - Type III 3. DEFINITIONS 3.1 ACCURACY The extent to which a given measurement agrees with t
24、he standard value for that measurement. Accuracy cannot be determined for this test procedure because of the lack of a standard value. 3.2 AERODYNAMIC DEVICE A structure or system added to the exterior of the vehicle for altering the aerodynamic forces acting on the vehicle 3.3 BASELINE SEGMENT (BS)
25、 A minimum of three (3) Runs with both the Control Vehicle and the unmodified Test Vehicle running simultaneously. SAE J1321 Revised FEB2012 Page 7 of 50 3.4 CARGO WEIGHT (CW) Is equal to the Gross Vehicle Weight minus the Tare Weight 3.5 CLASS 3 TRUCK/COMBINATION VEHICLERVehicle with gross vehicle
26、weight (GVWR) of 10,001-14,000 lbs (4,536.5 6,350.4 kg) 3.6 CLASS 4 TRUCK/COMBINATION VEHICLERVehicle with gross vehicle weight (GVWR) of 14,001-16,000 lbs (6,350.09 7,257.6 kg) 3.7 CLASS 5 TRUCK/COMBINATION VEHICLERVehicle with gross vehicle weight (GVWR) of 16,001-19,500 lbs (7,258.1 8,845.2 kg) 3
27、.8 CLASS 6 TRUCK/COMBINATION VEHICLERVehicle with gross vehicle weight (GVWR) of 19,501-26,000 lbs (8,845.7 11,793.6 kg) 3.9 CLASS 7 TRUCK/COMBINATION VEHICLERVehicle with gross vehicle weight (GVWR) of 26,001-33,000 lbs (11,794.1 14,968.8 kg) 3.10 CLASS 8 TRUCK/COMBINATION VEHICLERVehicle with gros
28、s vehicle weight (GVWR) of 33,001 or more lbs (14,969.3 kg) 3.11 COMPONENT Within the limitations of this test procedure, a component is defined as a part that can be added, attached or removed from the powered vehicle and/or a pulled vehicle. This may include but not be limited to fluids, lubricant
29、s, fuel additives, tires, aerodynamic enhancements, exhaust after-treatment, engine, or other power-train devices. Components which are not considered testable are such systems that: integral part of the overall system (i.e. Hybrid systems due to rotational inertial of motor system), unless the enti
30、re system and subcomponents are changed complete powered vehicle or powered portion of a combination vehicle 3.12 CONTROL VEHICLE (CV) The Control Vehicle is used to obtain reference data for the Test and is not modified in any way or used for any other purpose during the entire Test. 3.13 COMBINATI
31、ON VEHICLE An equipment configuration that includes a separate power unit and at least one unpowered pulled vehicle (trailer). 3.14 DATA POINT (DP) The quantity of fuel consumed by a single vehicle during a Run. SAE J1321 Revised FEB2012 Page 8 of 50 3.15 DRIVER Operator of a vehicle 3.16 DUTY/ DRIV
32、ING CYCLE The cycle is comprised of; length in miles, number of complete stops, distance between stops, average road speed using only rolling time, number of idle periods, length of total idle time and length of idle periods, engine speed and accessories used during idle period, reverse driving, and
33、 any unique shifting transmission or operational activity.3.17 FIFTH WHEEL A pivoting coupling device attached to a leading vehicle or component of a combination vehicle that supports the front of a trailer3.18 FLOW METER An instrument used to measure the rate of flow or volume of a fluid. 3.19 FUEL
34、 VOLUME MEASURING DEVICE/PROCESS The fuel volume measuring device/process with proven capability of measuring fuel volume within 0.5% for fuel consumption volumes typical of Run must be used. 3.20 FUEL WEIGH TANK An easily removable fuel tank. The tank should be appropriately sized to complete a tes
35、t run without risk of inducing air into the fuel lines. A good rule of thumb is approximately 2 times the estimated fuel necessary to complete a Run. The tank should be fitted with quick disconnect fuel lines so that it can be removed from the vehicle for weighing. The supply and return lines should
36、 be adequately spaced to ensure air does not enter the lines. The tank should satisfy Department of Transportation (DOT) safety requirements, see 49 CFR part 393, subpart E. 3.21 GAP, AERODYNAMIC Longitudinal distance between the aft most point of the cab external surface, including aerodynamic side
37、 fairings, and the forward most point of the cargo carrying portion of the vehicle. 3.22 GAP, TRACTOR TO TRAILER Longitudinal distance between the vertical flat surface of the back of the cab / sleeper to the vertical flat surface on the front of the trailer. 3.23 GLOBAL POSITIONING SYSTEM (GPS) A s
38、ystem of satellites, computers, and receivers that is able to determine the latitude and longitude of a receiver on Earth by calculating the time difference for signals from different satellites to reach the receiver. 3.24 GRAVIMETRIC Measurement by weight. 3.25 GROSS COMBINATION WEIGHT (GCW) Applie
39、s to combination vehicles. The combination of the total weight of the tractor (powered unit) the total weight of the trailer and the weight of the freight load. SAE J1321 Revised FEB2012 Page 9 of 50 3.26 GROSS VEHICLE WEIGHT (GVW) Applies to single unit vehicles. The total weight of a vehicle with
40、maximum freight load. 3.27 GROSS VEHICLE WEIGHT RATING (GVWR) The maximum allowable total mass of a road vehicle when loaded including the weight of the vehicles, fuel, passengers, cargo and trailer tongue weight. 3.28 MEAN The sum of the values of a random variable divided by the number of values 3
41、.29 NIST National Institute of Standards and Technology 3.30 OBSERVER A passenger in the vehicle responsible for maintaining and recording various Test operational conditions and assisting the driver.3.31 OEM Original Equipment Manufacturer. 3.32 POWERED UNIT The portion of the vehicle which include
42、s the primary propulsion system. 3.33 PRECISION The extent to which a given set of measurements of the same sample agree with their mean. 3.34 SCALE The scale is used to weigh the fuel weight tank and its contents during the test process. The scale must have sufficient capacity and resolution to sup
43、port the testing process as described in section 5.0.3.35 SEMITRAILER Truck trailer supported at the rear by its own wheels and at the front by a fifth wheel mounted to a tractor or dolly. 3.36 SINGLE UNIT VEHICLE A vehicle which has the powered portion and freight carrying unit mounted to the same
44、chassis. 3.37 STANDARD DEVIATION A measure of the spread or scatter of measures around the mean of those measures. 3.38 TARE WEIGHT (TW) Weight of empty vehicle with full fuel tanks, lubricants and trailer but without occupants or load. SAE J1321 Revised FEB2012 Page 10 of 50 3.39 TEST (T) A test is
45、 composed of a Baseline Segment and a Test Segment 3.40 TEST ROUTE, ON-ROAD The route shall be representative of the desired drive cycle under investigation. The route should have minimal traffic to increase repeatability. For consideration, roadways using a cloverleaf at the turn around point will
46、allow consistent and repeatable operation of both vehicles for every run. The route shall have a common start and end point. 3.41 TEST ROUTE, ON-TRACK For on-track tests a test route consist of a specified number of laps around the test track.3.42 RUN (R) A complete and simultaneous circuit of the s
47、pecified Test Route by both the Test Vehicle(s) and the Control Vehicle. The Run must be completed without the occurrence of an equipment failure or malfunction, driver error, or a failure to obtain all required weather and operational data. Each Run generates one Data Point for the Test Vehicle and
48、 one Data Point for the Control Vehicle. 3.43 TEST SEGMENT (TS) A minimum of three (3) Runs with both the Control Vehicle and a modified Test Vehicle.3.44 TEST TRACK A closed circuit road used to evaluate vehicle performance.3.45 TEST VEHICLE (TV) The Test Vehicle is used to evaluate modifications t
49、o a vehicle between the Baseline Segment and Test Segment of a Test. The modifications to the Test Vehicle may be components, technologies, or system changes.3.46 TMC Technology and Maintenance Council 3.47 TRACTOR A vehicle designed primarily to pull a semi-trailer by the use of the fifth wheel which is mounted over its drive axlel(s). Maybe called a truck/highway tractor to differentiate it from a farm tractor. 3.48 TRAILER A freight carrying unpowered unit pulled by a powered unit3.49 TRUCK A vehicle which carries cargo in a body (van, tank, etc.) which
