Accurate Engine Speed Control Using Adaptive Disturbance Observer

摘要

Accurate engine speed control is required to improve the shift quality of automatic transmissions. However, engine dynamics dramatically change with engine load and with engine aging. Therefore, conventional controls such as PID control cause large overshoots and thus cannot ensure accurate controllability. A control system composed of a sliding-mode controller and an adaptive disturbance observer was designed and applied to engine speed control to address these issues. The new control system has high robustness against changes in engine dynamics and an excellent ability to suppress overshoot. In addition, it provided accurate and rapid engine speed control under all engine conditions.