High-accuracy car level compensation device for a hydraulic elevator (stabilization using estimated acceleration feedback)

摘要

The objective of this study is to improve the servo stiffness and stability of the high-accuracy car level compensation device in a hydraulic elevator, which is used to reduce the car position fluctuation caused by passengers getting on or off. The previous compensation device is composed of an electro hydraulic position servo system. In order to enhance this system, an observer is introduced to estimate the car acceleration, and a pseudo-acceleration feedback control is applied.