To Improve the Performance of Proportional Valve Controlled Hydraulic Rotary Servo via Nonlinear Compensation

941797

09/01/1994

Event
International Off-Highway & Powerplant Congress & Exposition
Authors Abstract
Content
A hydraulic system is inherently nonlinear and sometimes its performance is greatly affected by those nonlinear factors such as deadband, saturation, hysteresis etc. For a system characterized with badly nonlinear behavior, the predominent nonlinearity must be well determined and compensated, otherwise the performance of the system will suffer. As an example, a hydraulic proportional valve controlled rotary motor servo is analyzed in this paper. Through theoretical analysis and experimentation result, a deadband is determined as the predominant nonlinearity in such system and parameters of the deadband are estimated by using system identification method. A nonlinear controller consisting of a linear pole-placement control algorithm and a deadband compensator is designed for the rotary hydraulic system. Experimental results illustrate that such a system controlled by this nonlinear controller exhibits much better overall performance as compared with that controlled by a conventional PI controller. We have also replaced the low-cost proportional valve by a servovalve to verify the overall system performance, which shows that a proportional valve can challenge a servo valve, if a proper nonlinear compensator is designed for the proportional valve.
Meta TagsDetails
DOI
https://doi.org/10.4271/941797
Pages
10
Citation
Xiong, Y., LeQuoc, S., and Cheng, R., "To Improve the Performance of Proportional Valve Controlled Hydraulic Rotary Servo via Nonlinear Compensation," SAE Technical Paper 941797, 1994, https://doi.org/10.4271/941797.
Additional Details
Publisher
Published
Sep 1, 1994
Product Code
941797
Content Type
Technical Paper
Language
English