Hydrodynamic Drive Test Code
|Publication Date:||1 December 2018|
The range of test conditions on the dynamometer shall be sufficient to determine the primary operating characteristics corresponding to the full range of vehicle operations.
The characteristics to be determined are:
Torque ratio versus speed ratio and output speed
Input speed versus speed ratio and output speed
Efficiency versus speed ratio and output speed
Capacity factor versus speed ratio and output speed
Input torque versus input speed
NOTE: For more information about these characteristics and the design of hydrodynamic drives, refer to "Design Practices: Passenger Car Automatic Transmissions," SAE Advances in Engineering, AE-18 (Third Ed.) or AE-29 (Fourth Ed.).
This code provides a means of determining operating characteristics of hydrodynamic drives used in motor vehicle applications. It outlines a series of dynamometer tests and provides a method of presenting data from these tests. The results obtained are complete enough to provide a basis for estimating vehicle performance. Other special tests, such as centrifugal bursting, heat rejection, extreme temperature, cavitation, and charging pressure, may be required to evaluate the unit for particular applications or conditions.