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.
An Improved Real-Time Model of a Planetary Gear Train
Sae Technical Papers
SAE International Congress and Exposition ; 1997
1997-02-24
Aufsatz (Konferenz)
Englisch
An improved real-time model of a planetary gear train
Kraftfahrwesen | 1997
|An Improved Real-Time Model of a Planetary Gear Train
British Library Conference Proceedings | 1997
|Online Contents | 1994
|Epicycloidal gear train including bushing-free planetary gear
Europäisches Patentamt | 2018
|