SAE J2452_201707
Current
The latest, up-to-date edition.
Stepwise Coastdown Methodology for Measuring Tire Rolling Resistance
Hardcopy , PDF
English
26-07-2017
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FOREWORD
1. SCOPE
2. REFERENCES
3. DEFINITIONS
4. SYMBOLS
5. CONVERSION FACTORS
6. TEST EQUIPMENT
7. TEST CONDITIONS
8. TEST PROCEDURE
9. DATA REDUCTION AND ANALYSIS
10. PRECISION AND BIAS
11. NOTES
APPENDIX A - VERIFICATION OF METHODOLOGY USED FOR THIS
RECOMMENDED PRACTICE
APPENDIX B - SURFACE CONDITIONING PROCEDURE
APPENDIX C - DETAILS OF THE PRECISION AND BIAS STUDY
APPENDIX D - EPA SCHEDULE DEFINITIONS (TIME VERSUS
VELOCITY)
APPENDIX E - ESD TABLE
APPENDIX F
Pertains to pneumatic Passenger Car 'P' Type, Light Truck Metric, and Light Truck High Flotation tires, or similar tires approved by bodies other than Tire & Rim Association.
| DocumentType |
Standard
|
| Pages |
39
|
| PublisherName |
SAE International
|
| Status |
Current
|
| Supersedes |
This SAE Recommended Practice is applicable to pneumatic Passenger Car “P” Type, Light Truck Metric, and Light Truck High Flotation tires, or similar tires approved by bodies other than Tire & Rim Association. The methodology is applicable within normal operating ranges of vertical load and inflation pressure, and for velocities between 115 km/h and 15 km/h (71 mph and 9 mph) during a relatively short duration event such as a coastdown. This procedure is applicable only to operation in the free-rolling mode at zero slip and camber angle for ambient temperatures between 20 °C and 28 °C (68 °F and 82 °F) and for surfaces with diameters of 1.2 m (48 in) diameter or greater. Details regarding the equipment, tires, and test methods used specifically for validation of this document are included in
Appendix A
. Two basic measurement methods covered by this document are as follows:
| SAE J1270_200609 | Measurement of Passenger Car, Light Truck, and Highway Truck and Bus Tire Rolling Resistance |
| SAE J2264_201401 | Chassis Dynamometer Simulation of Road Load Using Coastdown Techniques |
| SAE J2047_201303 | Tire Performance Terminology |
| SAE J1269_200609 | Rolling Resistance Measurement Procedure for Passenger Car, Light Truck, and Highway Truck and Bus Tires |
| SAE J2263_200812 | Road Load Measurement Using Onboard Anemometry and Coastdown Techniques |
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