Theoretical Investigation on Automatic Transmission Efficiency 960426

This paper introduces mathematical equations for power loss calculations of major automatic transmission components.It also presents a theoretical investigation on contributions of each component's power loss to transmission total power losses.A computer program for automatic transmission efficiency calculation has been developed based on mathematical equations.Efficiency calculations for the Hyundai A4BF1 electronic 4 speed automatic transmission has been executed in order to validate the program.The calculated efficiency under various input and operating conditions - such as different input torque & RPM, transmission gear state, ATF temperature, torque converter clutch on/off - showed quite good agreement with the test results.


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