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SAE J1540 (NOV2012)

Current Revision

Manual Transmission Efficiency and Parasitic Loss Measurement

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Because of the intense focus on fuel economy and fuel emission standards, it has become imperative to optimize vehicle drivetrains. 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 a test procedure which maps torque transmittal efficiency and parasitic losses for manual transmissions. The application of this document is intended for manual transmissions used in light (class 4) through heavy truck applications with both simple and compound ratio structures. This document is separated into two parts. The first compares input and output torque throughout a specified input speed range in order to determine the overall transmission efficiency. This test is used to evaluate all forward gears; testing in reverse is optional. The second procedure measures parasitic losses experienced at zero output torque over a range of operating speeds. A procedure for further reduction of this data into a loaded efficiency from gear and bearing systems is also provided.

SDO SAE: SAE International
Document Number J1540
Publication Date Nov. 9, 2012
Language en - English
Page Count 10
Revision Level 201211
Supercedes
Committee
Publish Date Document Id Type View
Nov. 9, 2012 J1540_201211 Revision
Nov. 2, 2000 J1540_200011 Revision
April 1, 1992 J1540_199204 Revision