SAE Standards Works
Drivetrain Standards Committee
J3039 - Definition and Measurement of Power Transfer Unit Speed-Dependent Parasitic Loss
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Andreas E. Perakes
Definition and Measurement of Power Transfer Unit Speed-Dependent Parasitic Loss
This SAE Recommended Practice covers power transfer units (PTUs) used in passenger car and light truck applications. PTUs may be of the chain, geared, single- or multi-axis type and may incorporate a disconnect system that is manually or electronically shifted, although other configurations are possible. The operating points (speeds, temperatures, etc.) were chosen to mirror those of the United States Environmental Protection Agency Vehicle Chassis Dynamometer Driving Schedules (DDS).