Design of Observer-based Output Feedback Clutch Slip Controller for Automatic Transmission

摘要

In this paper, an observer-based output feedback controller is designed for clutch slip control of automatic transmission where not all states are measurable. The control system consists of a reduced-order observer and a nonlinear state feedback controller. The main contribution of this paper is that an integral action of the tracking error is introduced to reducing the steady-state error of the system. Robustness of the tracking error system is discussed in the framework of Input-to-State Stability (ISS) theory, where the disturbance inputs are considered as estimation error from the observer and unmodelled dynamics respectively. Moveover, lookup tables, which are widely used to represent complex nonlinear characteristics of engine systems, appear in their original form in the designed controller. Finally, the designed controller is tested on an AMESim powertrain simulation model to demonstrate the effectiveness of the proposed control scheme.