A Periodic Scheme for Pipelining Unstable Digital Controllers

Authors:	Yang Ran, The University of Melbourne, Australia Zhang Cishen, Nanyang Technological University, Singapore Xie Lihua, Nanyang Technological University, Singapore
Topic:	3.1 Computers for Control
Session:	Real-time Embedded Systems
Keywords:	Pipelining processing, closed loop system, digital controller, stability

Abstract

Pipelining is a means of obtaining fast sampling and processing speed in hardware implementation of digital systems and it requires a look ahead system model for the pipelined system. However, existing methods for the design of look ahead system models are only for stable systems and hence are not applicable to unstable digital controllers for closed loop system control. In this paper a periodic method is presented for the design of look ahead system models for unstable digital controllers. Analysis is carried out to show that the pipelined implementation of the unstable digital controller using the proposed periodic look ahead system model can maintain the closed loop control system stability.