Dynamic Lever: Key to Transmission and Drivetrain Dynamics

Paper #:
  • 2018-01-1165

Published:
  • 2018-04-03
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Abstract:
Lever analogy has been developed for more than 30 years. The powerful tool can greatly simplify transmission analysis and has been widely used for powerflow analysis, selection and control synthesis. In the past two decades, automatic transmissions have undergone a rapid growth with continual increase in the number of speeds. Although the lever analogy has played important roles in the system design, the significant increase in complexity in today’s automatic transmission has presented great challenges to shift controls and NVH development. Many unpredicted issues have been NVH related and difficult to troubleshoot, which is partially due to the lack of proper modeling and analysis tool that can capture the drivetrain dynamics including transmission components. In this paper, we will introduce a more complete modeling approach in the framework of lever analogy, which can greatly extend the capability of the conventional lever analysis from kinematics the true system dynamics. The powerful tool has been proven effective in transmission analysis, control design and troubleshooting.
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