An Improved Real-Time Model of a Planetary Gear Train

Paper #:
  • 970970

Published:
  • 1997-02-24
Citation:
Klages, B., Woermann, R., and Theuerkauf, H., "An Improved Real-Time Model of a Planetary Gear Train," SAE Technical Paper 970970, 1997, https://doi.org/10.4271/970970.
Pages:
10
Abstract:
Advanced automatic transmissions are controlled by electronic control units (ECUs) which perform the gear change and furthermore a lot of complex control and diagnostic functions. Hardware-in-the-loop simulation (HIL) is a powerful tool to develop and test the control algorithms implemented in the ECUs. The simulation is based upon mathematical models of the different power train components, adapted to the real-time requirements. In this paper an improved real-time model of an automatic transmission with a Ravigneaux planetary gear train is presented. This transmission contains among other components numerous clutches and brakes. The time-variant states of these nonlinear elements (sliding and static friction) lead to numerical problems with respect to real-time simulation. In the suggested model the transferred torques of the different clutches and brakes are calculated using the methods of multi-variable control.
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