Because of the intense focus on CAFE and fuel emission standards, optimization of the automobile drivetrain is imperative. In light of this, component efficiencies have become an important factor in the drivetrain decision-making process. It has therefore become necessary to develop a universal standard to judge transmission efficiency.
This SAE Recommended Practice specifies the dynamometer test procedure which maps a manual transmission’s efficiency. The document is separated into two parts. The first compares input and output torque throughout a specified input speed range in order to determine “in-gear” transmission efficiency. The second procedure measures parasitic losses experienced while in neutral at nominal idling speeds.
The application of this document is intended for passenger car and light truck.
All references to transmissions throughout this document include transaxles.
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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MANUAL TRANSMISSION AND TRANSAXLE EFFICIENCY AND PARASITIC LOSS MEASUREMENT
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MANUAL TRANSMISSION AND TRANSAXLE EFFICIENCY AND PARASITIC LOSS MEASUREMENT
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