Engine, integral automatic transmission, driveline or trailer-axle retarders
It assumes that foundation brakes are notused 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 eachgear, 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.
Rationale
Changes to this document include:
1
Editorial changes to comply with the SAE Technical Standards Board format. Metric was included in this version of the document.
2
The Scope changed to Section 1. Purposed changed to 1.1 and References were added.
The Truck and Bus Powertrain Committee reports to the Truck and Bus Total Vehicle Steering Committee. The committee initiates, develops, reviews and approves standards, recommended practices and technical information reports related to heavy duty power trains. This includes 1) conventional energy management (diesel), alternative fuels (natural gas), mechanical energy storage (flywheels), electrical energy storage, (ultracapacitors), and pneumatic (compressed air, hydraulic hybrids); 2) power generation and conversion (diesel engines, generators, traction motors, hydraulic pumps and motors, retarders); 3) power and torque transmission (manual and automated transmissions, clutches, differentials, axles and drive shafts); 4) accessories and accessory drives; 5) any new technology that may arise that is related to heavy duty truck & bus power trains.
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Heavy Truck and Bus Retarder Downhill Performance Mapping Procedure
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Heavy Truck and Bus Retarder Downhill Performance Mapping Procedure
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