摘要:AbstractShift quality for clutch-to-clutch shifts in an automatic transmission is governed by controller performance in both the torque and inertia phases. In the current study, the problem of inertia phase control is investigated with emphasis on robustness with respect to clutch friction characteristics. A combination of sliding mode control and adaptive feedback linearization is used to achieve the desired reference tracking for the oncoming clutch slip speed. Since the dynamics of electro-hydraulic actuation of the clutch plays a critical role in determining shift quality, a formal treatment of electro-hydraulic system dynamics is presented which consists of state-space averaging and model order reduction based on time-scale analysis. The resulting reduced order model is used as the basis for controller design and is shown to lead to effective and robust inertia phase control. A validated high-order model of the transmission shift hydraulic system in a production transmission is the platform used for controller evaluation.