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Theoretical Investigation on Automatic Transmission Efficiency
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English
Abstract
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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Citation
Park, D., Seo, T., Lim, D., and Cho, H., "Theoretical Investigation on Automatic Transmission Efficiency," SAE Technical Paper 960426, 1996, https://doi.org/10.4271/960426.Also In
Transmission and Driveline Systems Symposium: Efficiency, Components, and Materials
Number: SP-1154; Published: 1996-02-01
Number: SP-1154; Published: 1996-02-01
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