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SAE J1489 (MAY2000)

Current Revision

Heavy Truck and Bus Retarder Downhill Performance Mapping Procedure

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The procedure covers the estimation of the total retardation capability available to a specific vehicle from: a Natural retardation (rolling resistance, aerodynamic drag, etc). b Engine drag c Engine, integral automatic transmission, driveline or trailer-axle retarders It assumes that foundation brakes are not used for maintaining speed on long mountain descents. Retardation is rated in terms of the maximum grades on which stable control speeds can be maintained for each gear over the range of highway speeds appropriate to that gear. For each gear , the calculation procedure determines maximum grades for at least four values of control speed ranging from the vehicle velocity corresponding to full load governed engine rpm, to the vehicle velocity corresponding to the engine rpm at minimum (idle) speed. In addition, the calculation procedure provides information on the total retarding power available for each gear.

SDO SAE: SAE International
Document Number J1489
Publication Date May 1, 2000
Language en - English
Page Count 17
Revision Level 200005
Supercedes
Committee
Publish Date Document Id Type View
May 1, 2000 J1489_200005 Revision